The percent change in the airborne lead concentration between 1980 and 2000 was closest to which of the
following?
a.
10%
b.
18%
c.
57%
d.
72%
e.
93%
Answers
Answer:
C. 57%
Can you please make this a Brainliest answer :)
Plzzz!!!!
The percent change in the airborne lead concentration between 1980 and 2000 was closest to 57%.
What is airborne lead concentration?Airborne lead concentration refers to the amount of lead particles that are present in the air. These particles can come from a variety of sources, including industrial activities, vehicle emissions, and lead-based paint. When lead particles are present in the air, they can be inhaled by people and animals, which can lead to health problems.
The concentration of airborne lead is typically measured in micrograms per cubic meter (µg/m3) of air. In some cases, exposure to high levels of airborne lead can cause acute symptoms, such as headaches, nausea, and fatigue. Over time, exposure to lower levels of airborne lead can also have serious health effects, including developmental delays, cognitive impairment, and an increased risk of cardiovascular disease.
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Related Questions
Pleaseee help me. I have to make a mnemonic on the Levels of classification from largest to smallest and i have no idea how to begin. Could you guys give me some mnemonics so i can turn this in already. Plzz don't put any links or answers that aren't valid to my question, you will get reported.
Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species
(thats the order from largest to smallest) And plz don't look up examples and copy them b/c i have to have original thoughts and i'll know if u do copy and paste them
Answers
Do Kind People Call Out From Generous... Salamanders?
Do Karens Protest Calling Olivia From Gym Strange-
laughing*
EASY but please help
Answers
Answer:
what do you need help with?
Answer:
Aa
Explanation:
I answered that for one of my tests and got it right. Hope it helps.
In which of the following areas would secondary succession most likely occur?
A) A lava flow
B) An area with a well-balanced, well-established ecosystem.
C) A previously forested area devastated by fire.
D) A rock ledge exposed by the melting of the glacier that covered it.
To help answer choice B is not the correct answer
Answers
Answer:
Correct answer is A
Explanation:
The secondary succession is likely to occur in those areas where vegetation was present earlier by a lava flow.
Where would secondary succession occur?Secondary succession may occur in left crop fields, cutover forests, areas harmed by wind storms or overflows, and other formely occupied parts. The conditions that result in secondary succession are usually sharp.
Thus, secondary succession most likely occur a lava flow, occur in those areeas was where vegetation was present.
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Pls help meeeeee plsssssss
Answers
What interaction is there between the brown tree snakes and the birds, lizards, and bats?
Answers
Answer:
Predatory.
Explanation:
This is because the tree brown snakes feed on birds while the bats feed on the lizards.
This is so that the bats can eat lizards while the tree brown snakes can eat birds. The brown tree snake bites and grips its victim to paralyze it.
What is predatory behavior brown tree snakes and other?The predators of the brown tree snake are not widely known. According to some research, monitor lizards, feral pigs, and cats prey on brown tree snakes, and other.
Investigations have revealed that the species is also vulnerable to red-bellied black snakes and cane toads.
The snake encircles its victim's body with its own and begins to chew, allowing its teeth with grooves to release venom into the area.
Since mammals are less susceptible to the venom's effects than other animals, it is considered to be rather moderate.
Therefore, predatory interaction is there between the brown tree snakes and the birds, lizards, and bats.
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Based on the temperature data in the table which chemical reaction should the students use for their food carrier design
Answers
Answer:
Reaction 1
Explanation:
Reaction 1 would be the most suitable in this case. This is so because in reference to the question you are wanting to keep the food warm over long periods. So in reference to the data in the chart reaction 1 continues to heat up over long periods of time. However, with the other reactions (2, 3, 4) temperatures vary and some even decrease constantly. Therefore showing that the other reactions are invalid to help reach your goal referencing back to the question.
A goal of rapid-transit systems is to decrease air pollution. True False
Answers
Have a good day
a.
If all members of a species disappear from Earth, the species is said to be
extinct.
b. endangered.
threatened.
d. keystone.
C.
Answers
Answer:
The species is extinct.
Explanation:
Endangered signifies that species will soon go extinct.
If fall months in the Northern Hemisphere experience greater cloud cover
compared to the average during a year, which of the following would
likely happen?
Choose all that apply:
-Temperatures would go up in the Northern Hemisphere.
-Temperatures would go down in the Northern Hemisphere.
-The amount of the sun's energy absorbed by Earth would decrease.
-The amount of the sun's energy absorbed by Earth would increase.
Answers
Answer: - The amount of the sun's energy absorbed by Earth would decrease.
- Temperatures would go down in the Northern Hemisphere.
Explanation:
Together, the stages of cellular respiration break down one molecule of Choose... to generate a total of Choose... molecules of ATP. The remaining energy is released as Choose... .
Answers
Answer: 1) Glucose
2) 36
3) Heat
Explanation: Cellular respiration is a metabolic process that every living organism undergo. It is the process by which energy is obtained by living cells. In the process of celluar respiration, energy-storing food molecule called Glucose is broken down in the presence of oxygen in order to release its energy and convert it to a usable form by the cell called ATP.
Celluar respiration occurs in three distinct stages in eukaryotes viz: Glycolysis Kreb's cycle and Oxidative phosphorylation. In Glycolysis, which occurs in the cytoplasm, glucose is broken down in a series of enzymatic reaction to yield Pyruvate and releasing a net gain of 2 ATP molecules. In Kreb's cycle, which occurs in the mitochondrion, produces carbondioxide in a two-cycled reaction involving Pyruvate. 2 ATPs are also produced in this stage.
Lastly, in Oxidative phosphorylation also occuring in the mitochondrion, electrons are passed through electron acceptors to create a pump that generates the synthesis of 32 ATP molecules. In general, the three stages yield a total of 36ATP molecules from one molecule of GLUCOSE.
The rest of the energy from the oxidation of glucose is lost as heat energy, which is responsible for the warming effect we feel. braibnliest??
PLEASE HELP
What is the displacement of the object?
0-2 m
O -1 m
O 3 m
O 4 m
Answers
In an Antarctic pelagic community, the primary producers are phytoplankton, which serve as food for the dominant grazing zooplankton, especially krill and copepods, both of which are crustaceans.
These zooplankton species are in turn eaten by various carnivores, including other plankton, penguins, seals, fish, and baleen whales. Squids, which are carnivores that feed on fish and zooplankton, are another important link in these food webs, as they are in turn eaten by seals and toothed whales (Figure 1).
Figure 1: Arrows follow the transfer of food from the producers (phytoplankton) up through the trophic levels. For simplicity, this diagram omits decomposers.
Antarctic krill (Euphausia superba) is an important source of food for whales, seals, squid, fish, and many species of birds. Its abundant biomass is one of the largest on Earth. Figure 2 compares the effects of krill harvesting on species richness within two small sections of the Antarctic region; one section was subject to krill harvesting and the other section was not.
Describe how the autotrophs facilitates the flow of energy through the Antarctic ecosystem. In the Antarctic pelagic community, there are three types of seals. The leopard seals eat birds, but the crabeater and elephant seals do not. Explain how the interactions between seals and other species may affect their food sources.
Identify the independent variable of the data graphed in Figure 2. Explain one way this variable is affecting the biodiversity of the Antarctic food web.
Analyze the change in species richness with or without krill harvesting. Predict how the removal of krill from the Antarctic ecosystem will affect its long-term structure.
Justify the claim that the Antarctic krill is a foundation species, not a keystone species. Provide evidence to support your claim.
Answers
Answer:
a) the autotrophs produce their own energy in their system and synthesize surrounding energy, which allows for the flow of energy as they are the primary producers at the bottom of the food web shown in figure 1 who transfer and facilitate their energy when they are consumed by the organisms in higher levels. This facilitation of energy continues where the population of these autotrophs is stable and the cycle of consumption and synthesis of energy from one trophic level to another and there is a diverse amount of energy distributed in the ecosystem. The leopard and Elephant seals have a similar food preference which may cause competition for resources in the ecosystem between the two more than that of the crabeater seal as they rely solely on krill in the ecosystem to survive. If there was more competition for the krill or a decrease in population, their population is sure to suffer as well.
b) The year is independent of the number of species in the data graphed. This variable affects the biodiversity in the food web where we witness the number of species (hundreds) likely to witness an increase over time when krill are harvested and a decrease in the number of species without krill harvesting. This, in turn, may prove that krill is a keystone species crucial in the food web and ecosystem where the antarctic krill population's presence will influence the number of species as well.
c) The changes in species richness with krill harvesting, as per mentioned, will show an increase in species number as the krill's energy is transferred throughout the ecosystem by consumption, as implied in the food web. The changes in species richness with a lack of krill harvesting, or some organisms unable to consume the energy of the krill, was shown to have a decrease in species # over the years. This will affect the long term structure of the ecosystem as the organisms who rely on krill and even those in the trophic levels which rely on species who consume krill will drop dramatically, and the lowering of the number of organisms in a keystone species will cause a decrease in speciation of the ecosystem (possibly quite rapidly due to the dependence we witness on it) as well as a disruption in the energy flow.
d) we can affirm that the krill are in fact not a foundation species, but a keystone species as they show no specific traits of facilitating the populations of the species in the ecosystem, and don't appear to benefit other species in the ways foundation species do (ie. they are autotrophs and cannot provide shelter for other species, but we can also say that they are the sole energy producers for the crabeater seals, which can be a trait of a foundation species)- instead exhibiting the traits of a keystone species as they produce an abundance of energy in the ecosystem and the removal of them (as shown in figure 2), causes a population decrease all around.
Explanation:
ur welcome i just did this myself so pls paraphrase as much as u can also like a bit of an explanation its kinda obvious from the chart that they all rely on the krill and stuff so removing it (or not harvesting or something) would be bad. again pls paraphrase as much as u can and good luck
Yoooooooooo neeeeeeeeed help on this
Answers
During which phase of cellular respiration is carbon dioxide released?
Krebs cycle
glycolysis
digestion
electron transport chain
Answers
Answer:
Krebs Cycle
Krebs's cycle releases the most CO2 as a wasteproduct
The atmospheric Carbon dioxide is released during the citric acid cycle (Krebs cycle) of the cellular respiration, which is utilized later. Thus, the correct option is A.
What is Cellular respiration?Cellular respiration is the process of oxidation of the sugar (glucose) to produce ATP (energy) in the mitochondria of cell. This process is essential as cell requires energy to perform the basic functions of the body.
Cellular respiration is divided into four main phases which include:
1. Glycolysis: The most critical pathway in carbohydrate metabolism
2. Pyruvate Oxidation
3. The Krebs Cycle
4. Electron Transport and Oxidative Phosphorylation
The Krebs cycle also known as Citric acid cycle includes the release of carbon dioxide which is then used in the electron transport chain and in the formation and processing of other important biomolecules in cell.
Therefore, the correct option is A.
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What is the matching complementary DNA strand to the following:
GCCATC? 1.AGGACG 2.CGGTAG 3. CGGAAG 4.CCGATT
Answers
Answer:
2. CGGTAG
Explanation:
G-C C-G
A-T T-A
When a persen is exposed to a pathogen for the first time, he or she may develop a rash, experience swelling, and increased temperature in the area, as well as a fever, These symptoms are due to swelling, and increased temperature in the area , as well as a fever. These symptoms are due to
Answers
Answer:
2nd one or the light blue one. Since it is the first time it cant is a direct response as it has never seen it before.
Explanation:
A(n)
mutation occurs when a base or sequence is doubled and
inserted in the sequence.
substitution
deletion
duplication
inversion
ASAP
Answers
Answer:
duplication
Explanation:
sequence / base is doubled and inserted = duplication
Write an Analogy This chapter includes an analogy about exchanging quarters for tokens at a game center to represent the process of transcription. Think of your own analogy for one of the processes you learned about in this chapter. Write a paragraph using that analogy to explain the process. Also, note any limitations of analogy(That is, in what ways does it not "" the process you're explaining ?)
Answers
What is the density of a metal cube that has a volume of 2 cm x 3 cm x 1cm and a mass of 12g? *
Answers
Answer:
Density of metal cube = 2 g/cm³
Explanation:
Given:
Dimensions of a cube = 2 cm x 3 cm x 1 cm
Mass of cube = 12 g
Find:
Density of metal cube
Computation:
Volume of a cube = 2 cm x 3 cm x 1 cm
Volume of a cube = 6 cm³
Density = Mass / Volume
Density of metal cube = Mass of cube / Volume of a cube
Density of metal cube = 12 / 6
Density of metal cube = 2 g/cm³
I need help this is due In 30 minutes
Answers
Answer: 43. Erosion breaks rocks down further and then moves them. Forces like wind and water move the rock pieces. They mix with matter like sand to become sediment. Weathering and erosion help shape Earth's surface. 44. After compaction and cementation the sedimentary sequence has changed into a sedimentary rock. Sedimentary rocks like sandstone, shale and limestone differ from other rocks in that they: 1. Are formed from layers of sediment built up over many years. Clastic sedimentary rocks are made up of pieces (clasts) of pre-existing rocks. Pieces of rock are loosened by weathering, then transported to some basin or depression where sediment is trapped. If the sediment is buried deeply, it becomes compacted and cemented, forming sedimentary rock. 45. metamorphic rock. 46. igneous or sedimentary rock. 47. Similarly, liquid magma also turns into a solid — a rock — when it is cooled. Any rock that forms from the cooling of magma is an igneous rock. Magma that cools quickly forms one kind of igneous rock, and magma that cools slowly forms another kind.
Explanation:
Bacteria are a form of animal-like protists.
TrueFalse
Answers
Answer:
Bacteria are a form of animal-like protists. Protozoa
Explanation:
What transports oxygen to cells in an arthropod?
Answers
The respiratory system is separate from the circulatory system. It is a complex network of tubes that delivers oxygen-containing air to every cell of the body.
Answer: tracheal tubes
Please answer quick and correctly
The last choice is 1 in 2.5 btw
Answers
Answer:
D) 1 in 2.5
Good luck!
The presence of which of the following could be used to distinguish between prokaryotic and eukaryotic cells?
Answers
Answer:
The answer is mitochondria that the difference between the prokaryotes and eukaryotes
Explanation:
Which of the following could limit the growth of a population of squirrels in a local park?
A. Increase in the number of trees preferred by the squirrels for nests
OB. A decrease in the number of hawks, which prey on squirrels
C, Heavy rain causing an increase in acorns that the squirrels eat
OD. An outbreak of a disease that infects squirrels in the park
Answers
Answer:
D
Explanation:
They would be dying off, or leaving to get away from the disease
An outbreak of a disease that infects squirrels in the park could limit the growth of a population of squirrels in a local park. As the disease spreads and more squirrels become sick or die, the population growth rate will decline and may even become negative, leading to a decrease in the overall population size. Hence option D is correct.
What is an infectious disease?An infectious disease is a type of illness that is caused by a pathogen, such as a virus, bacterium, fungus, or parasite. These pathogens can enter the body and cause harm by multiplying and damaging the host's tissues.
Infectious diseases can spread from person to person, through contact with contaminated surfaces, via airborne particles, or through the bite of an infected animal. Some examples of infectious diseases include influenza, HIV/AIDS, tuberculosis, malaria, and COVID-19.
When an infectious disease spreads in a population, it can weaken or kill members of that population, thus decreasing the overall population size. The spread of the disease may be more rapid and widespread in populations that are densely packed, such as the population of squirrels in a local park.
The disease could be caused by a pathogen, such as a virus or bacteria, and could spread through direct contact or through contaminated food and water sources.
Hence option D is correct.
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Question 23 (1 point)
Why is a eukaryotic cell able to be larger than a prokaryotic cell?
A.) Prokaryotic cells have a nucleus which decreases the volume of the cell
B.)Absence of membrane-bound organelles allows for enzymatic reactions.
C.)Membrane-bound organelles compartmentalize intracellular processes
D.)Eukaryotic cells have a nucleus which decreases the volume of the cell
Answers
Answer:
C
Explanation:
Eukaryotic cells have membrane-bound organelles that allow for compartmentalization. Prokaryotic cell do not share this feature.
A population of 600 plants contain 294 AA, 252 Aa, and 54 aa individuals. AA and Aa plants produce purple flowers while aa plants produce white flowers. What are the frequencies of the following?
Allele A
Allele a
purple-flowered plants
white flowered plants
genotype AA
genotype Aa
genotype aa
Answers
Answer: If both the AA and Aa individuals have Allele A, then the proportion of individuals with Allele A = (294 + 252)/600. However, if you want the proportion of times that A occurs in the gene pairs, this is ([2*294] + 252)/(2*600).
Proceed in a similar way with the other problems.
Explanation:
What is gravitational force?
-Pihu Roy ｡◕‿◕｡
Answers
According to Newton, The force between any two objects in the universe is called gravitational force or simply gravitation
hope it helps you ☺️ have a great day
celluar respiartion takes place in these improtnat organeelle of the cell
Answers
Answer: mitochondria the powerhouse of the cell
Explanation:
Answer:Mitochondria
Explanation: Mitochondria is reffered as the power plant cell. IT supplies the cells with ATP which is Adenosine 5'-triphosphate
HELP NEEDED ASAP
Which of the following solar phenomena is likely to have the most negative impact on Earth?
A. A solar flare as it may cause brief radio blackouts
B. An aurora as it may damage communication networks
C. An aurora as it may cause worldwide transmission problems
D. A solar flare as it may harm satellites and aircrafts flying near poles