Answer:
2. it disappeared because the heated up acid ate it away
Describe some of the basic trends in hominid evolution (brain size, jaw size, language, and manufacture of tools) using at least five (5) sentences.
Answer:
Hominids refers to humans and its closest relatives such as the chimpanzee, gorilla etc.
The basic trends in hominid evolution include:
1. The use of the rear limbs or legs for walking instead of four.
2. There was also an increase in the abuse and discoveries of the terrestrial habitat.
3. Their brain was known to increase in size which made them more sophisticated in thinking and knowledge.
4. They started making tools and used it to hunt wild animals for food.
5. There was a change in their diet as it went from fruits, leaves and other staple foods to the inclusion of a large amount of meat as a source of protein.
Which structure is most likely used for hunting?
Answer:
A.claws
Explanation:
Sequence the steps, 1–4, in the order required to create a permanent slide of human cheek cells. [1 mark] Specimen dehydrated Specimen embedded in wax Specimen cut into thin 'sections' Staining
Answer:
The correct order is dehydration, embed in wax, cut into sections, staining
Explanation:
There are certain proceedings needed to obtain stained sections of vegetable or animal tissues for their microscope observations.
These steps are:
Obtention of the material: The tissue is cut to an adequate size.Fixation: When tissues are extracted from the organism, they suffer autolysis and putrefaction, so they need to be fixated in order to keep their cells in the best state possible. Fixation involves preserving the original morphological and molecular characteristics of the tissue. Fixation avoids autolysis, putrefaction, distortion, and retraction of cells and the tissue that could affect its volume or morphology. Dehydration. Once fixated, the fixator must be eliminated and the tissue is dehydrated by using a gradual series of solutions with alcohol in ascendant concentrations. Dehydration must be gradual to avoid tissue deformation. Inclusion. To obtain thin cuts that can be observed under the optic microscope, the tissues must be included in a consistent, firm substance, that might be either hydrophilic or hydrophobic. A hydrophobic medium is paraffin wax, that provides hardness and plasticity. Cut. The tissue included in wax must be cut in slides or sections thin enough to allow the diffusion and penetration of light. A microtome is used to perform these cuts. When using paraffine for tissue inclusion, the cuts are about 5 to 20 micrometers of thickness. Stain. Once the cuts are performed, paraffin wax must be eliminated. This can be done by using an organic solvent. Then the tissue must be stained. Hematoxylin and Eosin are the most common dyes. Animal tissues in general do not have any natural color, so they need to be stained to be observed.PLEASE HELP I NEED IT TO BE RIGHT Which of these describes a method in studying plate movements? Select one: a. Observing absence of magnetic rocks in locations that do not match the poles Incorrect b. Match relief elements only on the western side of the Atlantic Ocean c. Recording the spread of the seafloor in the mid-Atlantic region d. Correlate the rotation of Earth to plate movement
Answer:
C. Recording the spread of the seafloor in the mid-Atlantic region
Explanation:
This seems to be the only logical answer. Since we are talking about a method in studying plate tectonics/movements, using evidence of it, seafloor spreading, would be the best idea out of the four.
Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other.
Hope this helped! :-)
Two cities have smokestacks on their plants. Which of the following weather conditions would you expect to create an increase in air pollution dispersal for one of the cities?
The city with a higher air pressure
The city with a higher humidity
The city with a lower wind speed
The city with a lower temperature
Answer:
The city with a higher air pressure
In a new trial to test the effectiveness for a new type of medicine, why is it necessary for one group to receive a placebo?
Answer:
To serve as control experiment.
Explanation:
Hope it helps.
If a horse and zebra breed to produce a sterile horse.____
means that one is
incapable of producing fertile offspring. In other words, their offspring cannot breed.
Describe biogeographic isolation?
Answer:
Biogeographic isolation is the separation of organisms of a species through geographical or biological forces.
Explanation:
Which base is found only in DNA?
adenine
O guanine
o cytosine
thymine
Answer:
DNA: adenine (A), thymine (T), cytosine (C
), and guanine
But thymine is only found in dna
and it is replaced by uracil in the rna
Which statement best describes the difference between vascular plants and
nonvascular plants?
O A. Vascular plants reproduce with seeds, and nonvascular plants do
not.
O B. Vascular plants reproduce with spores, and nonvascular plants do
not.
C. Vascular plants have vessels, and nonvascular plants do not.
O D. Vascular plants have flowers, and nonvascular plants do not.
SUBMIT
The correct option is A. Vascular plants reproduce with seeds, and nonvascular plants do not.
The following information should be considered:
A vascular plant contains vascular vessels to carry water and food to all the different parts of the plant. While on the other hand, Nonvascular plants are most commonly found in moist environments, which assured they get sufficient water without relying on roots.
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Select the right answer for each question.
7. The presence in the body of a disease is caused by.
a) germs
b) dead cell c) chemical unbalance
d) antibiotics
Answer:
A
Explanation:
The answer is A: germs.
what is the Mid-Atlantic Rift
Mechanisms of gene regulation
Which is an example of a chemical change?
Answer:
when you put chemicals in water and the water gets chemically changed?
Answer:
burning,cooking,rusting,and rotting.
Explanation:
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.
What does the length of a vector arrow represent?
O A. magnitude
ОО
O B. angle
O c. force
O D. direction
Answer:
Bottom line is "the length of a vector arrow is a scalar quantity representing how long (or short) the arrow is .
Explanation:
The length of a vector is also know as the magnitude. The magnitude determines how quickly something is moving through space whereas the direction tells you where the vector is going. hope this helps you :)
Answer:
A. magnitude
Explanation:
Magnitude is just another word for "size/length." You will typically see vectors often appear in physics and levels of math starting from pre-calc.
blood vessels that contain valves and rely on skeletal muscles to move blood are called:
A) arterioles
B) veins
C) capillaries
D) arteries
and why!? thanks!!
Answer:
veins because they carry low pressured blood due to which there is more chance for backward flow of blood and to prevent that they contain valves.
hope it helped uh..
Answer:
B. Veins
Explanation:
Veins carry blood relying on the action of the skeletal muscle as the body moves. Veins have valves so blood flows in only one direction. Valves are not present in arteries. Arterioles is small and contains valves to prevent backflow of blood but does not rely on skeletal muscles. Capillaries don’t have any valves. The correct answer would be veins.
Which statement describe a pattern shown in the data?
The data from trial 3 are inconsistent with the dat as from trials 1 and 2
The chart shows embryos of different animal phyla.
Based on the evidence of their embryos, which pair of phyla are most closely
related?
O A. Echinodermata and Annelida
O B. Mollusca and Arthropoda
O C. Mollusca and Echinodermata
O D. Annelida and Chordata
Answer: B
Explanation:
AP*X
Invertebrates with an exoskeleton, segmented bodies, and paired jointed appendages are known as arthropods.
Molluscan animals have soft bodies that are triploblastic, bilaterally symmetrical, and coelomate. Malacology is the study of Mollusks. They are slow-moving invertebrates with a thin fleshy envelope or mantle that protects the visceral organs.
What are the similarities between Mollusca and Arthropoda?They are triploblastic creatures.They are animals with bilateral symmetry.They're coelomates.They are organized at the organ system level.Thus, we can conclude that option B, Mollusca, and Arthropoda are correct.
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A population contains short plants and tall plants. The short plants are not able to compete with tall plants for sunlight. The tall plants, however, are more susceptible to wind damage. Which type of selection will this population of plants most likely experience? directional selection disruptive selection species selection stabilizing selection
Answer: D
Explanation: A population contains short plants and tall plants. The short plants are not able to compete with tall plants for sunlight. The tall plants, however, are more susceptible to wind damage.
Which type of selection are the plants experiencing?
directional selection
disruptive selection
If tall and small plants coexist in a population. Short plants are unable to compete for sunlight with tall plants. However, tall plants are more vulnerable to wind damage, it experiences stabilizing selection, hence option D is correct.
What is stabilizing selection?A form of natural selection when genetic diversity declines as a population stabilizes on a given trait value.
Disruptive selection's opposite is stabilizing selection. It favors the intermediate variants rather than people with extreme traits.
The more severe phenotypes are typically eliminated through stabilizing selection, which leads to the reproductive success of the average or typical phenotypes.
Therefore, stabilizing selection this population of plants most likely experience.
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Atoms have a _______
surrounded by _____
A. positive electron, negative nuclei
B. negative electron, positive nuclei
C. negative nucleus, positive electrons
D. positive nucleus, negative electrons
What is the oxidation hall reaction for 2Mg+O 2 2MgO ?
Answer:
2Mg(s) → 2Mg2+ + 4e. On the other hand, O2 was reduced: its oxidation state goes from 0 to -2. Thus, a reduction half reaction can be written for the O2 as it gains 4 electrons: O2(g) + 4e− → 2O.
Explanation:
which molecule loses electrons during cellular respiration?
Answer:
glucose
Explanation:
how did the modern atomic theory develop?
How does studying the cell help you better understand God’s creation?
Answer:
studying the cell helps you see how god has made thing unique
Explanation:
so see the bacics the animal is made by god and you can see the different features that god has put into the cells to help then survive hope this helps you rate 5 star and a thanks if it did
Will Mark Brainliest
Which of the following products were created through marine biotechnology?
Penicillin
Plasma television
Fluorescent dyes
Lithium batteries
Answer:
penicillin is the answer
Which two characteristics describe all organisms in the domain Eukarya?
O A. Their cells are eukaryotic.
B. Their cell walls lack peptidoglycan.
C. Their cells are prokaryotic.
D. Their cell walls have peptidoglycan.
SUBMIT
Answer:
A and B
Explanation:
Hope this helps U <3
The two characteristics that describe all organisms in the domain Eukarya are :
Their cells are Eukaryotic ( A ) Their cell walls lack peptidoglycan ( B )EukaryaEukarya is a domain which comprises of cell based oragnisms which contain nuclei or membrane organelles which are further divided into kingdoms such as Animalia and Fungi.They posses Eukaryotic cells and their cells walls lack peptidoglycan.
Hence we can conclude that The two characteristics that describe all organisms in the domain Eukarya are :
Their cells are Eukaryotic Their cell walls lack peptidoglycan.Learn more about Eukarya : https://brainly.com/question/13969093
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All wetlands are considered freshwater ecosystem
Answer:
Marshes, swamps, and bogs are all considered wetlands. ... Wetlands are not considered freshwater ecosystems as there are some, such as salt marshes, that have high salt concentrations—these support different species of animals, such as shrimp, shellfish, and various grasses.
Explanation:
i hope this helps you!
Answer:
It will be false
Explanation:
Took on edg
A silver mine recently opened along the foothills of a mountain. The mine's primary method for extracting silver from the surrounding rock is heap leaching. Which of the following hazards does this process most likely pose to the environment?
I. Atmosphere contaminated with heavy metals
II. Soil contaminated with cyanide
III. Surface water contaminated with sediment
Answers:
I only
II only
III only
I and II only
Soil contaminated with cyanides is the hazard which is the most likely pose to the environment. Thus, the correct option is B.
What is Cyanide contamination?Silver mining is the extraction of silver metal from minerals, starting with mining. Because of this silver, which is often found in the intimate combination with other metals, its extraction requires more elaborate and complex technologies.
Cyanide in the landfills can contaminate the underground water. Hydrogen cyanide, sodium cyanide, and potassium cyanide are the major forms of cyanide which are most likely to be found in the environment as a result of industrial activities. Hydrogen cyanide is a colorless gas with a faint, bitter, almond-like odor. Concentrated acids and cyanides are used to dissolve metals from the rock which are picked up in rainwater.
Therefore, the correct option is B.
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Two trees have the same girth but different heights. The volume of the shorter tree is estimated to be 142 cubic feet.
How can you use Cavalieri's Principle to find the volume of the second tree?
Answer:
im pretty sure the volume would be equal
someone please calculate the ratio of offspring please help pleaseeeeeeeeeeeeeeee
Answer:
2. 1 Pink : 1 white
3. 1 Red : 1 Pink
4. 1 Red : 2 Pink : 1 White
Explanation:
This question involves a single gene coding for flower colour in snapdragon plants. The alleles of the gene exhibits incomplete dominance i.e. the red allele (R) ia not completely dominant over the white allele (W), hence an intermediate pink phenotype (RW) is formed. Based on this, a red snapdragon will have genotype, CRCR while a white one will have genotype, CWCW. The intermediate pink phenotype will have a genotype, CRCW.
The image attached to this question shows four crosses between different traits.
In the second cross between a pink (CRCW) and white offspring (CWCW), 2pink and 2white offsprings will be possibly produced in the ratio 1:1.
In the third cross between a red (CRCR) and pink (CRCW) snapdragon, 2 red and 2 Pink offsprings will possibly be produced in a ratio 1:1.
In the fourth cross between a pink (CRCW) and pink (CRCW) snapdragon, red, pink and white offsprings will be produced in the ratio 1:2:1.
See attached image for the complete punnet square. Note that, there was a mistake in the Genotype of the last cross i.e. pink has genotype CRCW not CWCW.
Who first identified nucleic acids, and where were they discovered? Friedrich Meischer discovered nucleic acids in blood cells. Phoebus Levine discovered nucleic acids in plant cells. James Watson and Francis Crick discovered nucleic acids in DNA. Gerardus Johannes Mulder discovered nucleic acids in bacterial cells.
Answer:
Friedrich Miescher discovered nucleic acids in blood cells.
Nuclein was discovered by Friedrich Miescher in 1869
Explanation
In the somewhat early 1880s Albert Kossel further purified the substance and discovered its highly acidic properties. Then he later discovered the nucleobases. In 1889 Richard Altman creates the term nucleic acid. Friedrich Miescher was the first scientist to ever isolate nucleic acid.
Friedrich Meischer was the first who discovered nucleic acids in blood cells. The correct option is A.
Who was Friedrich Meischer?Miescher, Johannes Friedrich, was indeed a Swiss physician and biologist. In 1869, he became the very first researcher to extract nucleic acid.
He also discovered protamine and managed to make several other discoveries.
In the winter of 1868 the adolescent Swiss physician Friedrich Miescher carried out experiments on the chemical composition of leukocytes in the research lab of Felix Hoppe-Seyler at the University of Tubingen, which resulted in the discovery of DNA.
Thus, the correct option is A.
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