Oxygen entered the Earth's atmosphere after the appearance of the Great Oxidation Event (Great Oxygenation Event). The Great Oxidation is the first mass extinction on Earth.
The Great Oxidation lasted 2.4 to 2.0 billion years ago.
Oxygen appeared on Earth thanks to cyanobacteria using photosynthesis.
Oxygen first began to enter Earth's atmosphere after the appearance of cyanobacteria.
The ability to generate oxygen via photosynthesis likely first appeared in the ancestors of cyanobacteria. These organisms evolved at least 2.45–2.32 billion years ago, and probably as early as 2.7 billion years ago or earlier.Why cyanobacteria was important for evolution?Cyanobacteria carry out oxygen-evolving, plant-like photosynthesis. Earth's oxygen-rich atmosphere and the cyanobacteria origin of plastids in plants are the two major evolutionary contributions made by cyanobacteria. Certain cyanobacteria are able to carry out nitrogen fixation.To know more about evolution here
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Alternation of generation
Answer:
The answer to this question is given below in this explanation section.
Explanation:
"Alternation of generation"
Alternation of generations is the type of life cycle that occurs in those plant and algae in the archaeologist and the heterokontophyta that have distinct haploid sexual and diploid asexual stages.In these groups a multicellular haploid gametophyte with n chromosomes alternates with a multicellular diploid sporophyte with 2n chromosomes made up of n pairs.A mature sporophyte produces haploid spores by meiosis a process which reduces the number of chromosomes to half from 2n to n.
Two haploid spores germinate and grow into a haploid gametophyte.At maturity ,the gametophyte produces gametes by mitosis which does not alter the number of chromosomes.Two gametes from different organism of the same species fuse to diploid zygote,which develop into a diploid sporophyte . This cycle from gametophyte to sporophyte in the way in which all land plant and many algae undergo sexual reproduction.
Chronic traumatic encephalopathy (CTE) is caused by a single blow to the head.
IO
Which is a characteristic of
compounds?
A. Compounds are only pure
substances.
B. Compounds are the smallest
form of a particle.
C. Compounds are made of at
least two types of matter.
Answer:
the answer is C
Explanation:
compounds are made up of two or more atoms, so they are made up of at least two types of matter
Answer:
B
Explanation:
Compounds are very very small
What are the four types of air masses?
Answer:
There are four categories for air masses: arctic, tropical, polar and equatorial. Arctic air masses form in the Arctic region and are very cold
The function of a virus?
the function of a bacteria?
Answer:
the function of a virus is to deliver its genome into the host cell to allow its expression by the host cell. It will, at least attempt to, take over the body and infect the body with the disease virus on it.
the function of a bacteria can be good or bad. for good purposes for example, would be the digestive bacteria that breaks down the food and uses the energy to give the body energy. the bad version of bacteria is to spread from surface to surface, like the flu for example.
Explanation:
Each unique element is determined by the number of how many
Answer:
please post ur photo
Explanation:
unless we can't understand it
What are some
possible results of
base-pair substitutions?
Jerry is planning a scientific investigation to test an idea he has about how the
growth of a pea plant is affected by soil temperature. Which step should he do
first?
A: Form the conclusion
B: Plan the experiment.
C: Create the hypothesis
D: Conduct the experiment.
Answer:
C
Explanation:
C: Create the hypothesis
What is the importance of the amniotic egg?
Answer:
The amniotic egg was an evolutionary invention that allowed the first reptiles to colonize dry land more than 300 million years ago. Fishes and amphibians must lay their eggs in water and therefore cannot live far from water. But thanks to the amniotic egg, reptiles can lay their eggs nearly anywhere on dry land.
Explanation:
An amniotic egg has a clump of nutrients that is used to sustain the embryo during development. This clump of nutrients is called the yolk, and the yolk sac encloses it.
What is the answer to this question
the correct answer is c I believe
HELP DUE IN 5 MINS
What do you think are the three biggest changes a household could make to reduce its use of water?
Answer:
turn water of when brushing teeth, take shorter showers and dont waste water
Explanation:
Plant use sunlight, water, & carbon dioxide to produce glucose & oxygen. Plants are then able to use the glucose produced by the process described above as a quick source of energy for their cells, Which of the following molecule groups would glucose be classified as?
Glucose is by far the most common carbohydrate and classified as a monosaccharide, an aldose, a hexose, and is a reducing sugar.
Which organelle/cell part is responsible for detoxing the cell. It is a network of sac and channels that transport lipids and stores ions/proteins.
Answer:
Peroxisomes
Explanation:
Peroxisome a type of organelle present in both animal and plant cells, is a membrane-bound cellular organelle that often contains enzymes.
Peroxisomes, including lipid synthesis and chemical detoxification, conduct major roles. Peroxisomes play a crucial role in particular biomolecules being oxidized. They also contribute to the biosynthesis of plasmalogens-known membrane lipids.
What is an organelle?
Explanation:
An organelle is a specific structure within a cell, and there are many different types of organelles. Organelles are also called vesicles within a cell. ... So really, organelles are all membrane-bound. And they separate one function from another function.
Organelles is also known as any of a number of organized or specialized structures within a living cell. Three organelles contain DNA: the nucleus, chloroplasts, and mitochondria.
Identify the type of algae growing on Prospect Park Lake.
Golden Algae
Kelp Algae
Blue-green Algae
(This is 7th grade science)
Answer:
Uh i dont know for sure but i think Blue green Algae
Explanation:
Name the four main categories of carbon compounds that are important to the structure and function of cells. Provide an example of each.
Answer:
Carbs, Lipids, Nucleic Acids, and Proteins.
Explanation:
Carbs - potatoes, bread, rice
Lipids - fats, oils, waxes
Nucleic Acids - DNA, RNA
Proteins - enzymes, hair
Main categories of carbon compounds are carbohydrates, lipids, nucleic acids and proteins.
What are the functions of carbon compounds?A compound found mainly in living things is known as an organic compound. Organic compounds make up the cells and other structures of organisms and carry out life processes.
Carbon is one of the major elements by which organic compounds cannot be imagined. Its compounds are very useful in human life as well as for nature.
Some common uses of carbon compounds are: Carbon can be used as a decorative tool in jewelry pieces. Fossil fuels such as crude oil, methane gas.
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What is the term for a series of two cell divisions where a specialized diploid cell becomes four
haploid daughter cells?
O binary fission
O fertilization
O reduction division
O mitosis
Plz help me
Answer: isn’t it meiosis ?
Explanation:
PLS HELP!!!!!
which process is used by animals to obtain food from the environment?
a. egestion
b. dehydration synthesis
c. mechanical digestion
d. ingestion
Answer:
D ingestion
Explanation:
help pleaseeeee and please don’t waste my time by saying that ydk :) ty
Answer:
1. Arsenic, benzene, formaldehyde, lead, and mercury are just a few of the more than 70 cancer-causing chemicals in cigarette smoke.
2.They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation. They also help propel sperm.
3.Spirometry measures how much air you can breathe in and out. It also measures how fast you can empty the air out of your lungs. Spirometry helps diagnose breathing problems such as asthma and COPD.
4. Tar causes cancer of the lungs, mouth and throat.
Which of the following can be interpreted from an age-structure diagram of a country? *
1 point
The maximum age when women give birth
The total fertility rate of the population
The relative population growth rate of the population
The carrying capacity of the local environment
Answer:
a
Explanation:
Ill give brainliest... its currently 12:20 am and im too tired to re answer this "correctly". Please help a human out
Many pine trees grow in the taiga, the largest habitat in the world. Using credible sources, such as NASA, research the typical climate conditions in the taiga. Explain why the structure of pinecones helps ensure successful reproduction in the taiga.
Answer:
Explanation:
Taigas have few native plants besides conifers. The soil of the taiga has few nutrients. It can also freeze, making it difficult for many plants to take root. The larch is one of the only deciduous trees able to survive in the freezing northern taiga.
How many pairs of homologous chromosomes are in this picture?
Help plz
Answer:
3
Explanation:
they are in a similar gene position
Help me PLEASE! Choose one answer! First one to answer get Brainliest!
3.) An organism's pre-birth stage of development?
A.) Fossil Record
B.) Embryo
C.) Coral
D.) Gastropod
Answer:
it is the embryo 100% I am sure of it
Answer:
B
Explanation:
Embryo is an organism in the earlier stages of development; in humans, usually the cell growth up to the end of the seventh week in utero
What type of inheritance pattern shows both traits in possible offspring
Answer:
Codominance
Explanation:
Codominance is when two dominant traits are equally dominant, and therefore they both are expressed in the offspring's phenotype. For example, if in a flower, blue (BB) and red (RR) are codominant their offspring would be both red and blue. One of the common examples of codominance in humans is blood type, which is seen in AB blood since A and B are equally dominant.
Which describes the purpose of the circulatory system? *
A.to remove digestive waste
B. To supply oxygen and nutrients to the body via blood vessels
C.to control all of the movement within the body
D. to remove liquid waste as urine
Answer:
B. To supply oxygen and nutrients to the body via blood vessels
Explanation:
What happens to jet streams as they get closer to the equator?
They blow faster.
They do not change.
They dissolve.
They blow slower.
Answer:
The 4th is the answer (They blow slower)
Jet streams blow slower as they get closer to the equator.
What are Jet streams?Jet streams are fast flowing, narrow, meandering air currents in the
atmospheres present in some planets such as Earth.
The Equator which is the imaginary line that divides the planet into
Northern and Southern hemisphere possess jet streams which blow
slower as a result of light winds found in this region.
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Which of the following is not a symptom of desertification?
A) decrease in salt content of the soil
B) lowering of the water table
C) reduced surface water
D) increased soil erosion
E) loss of native vegetation
Answer:
A
Explanation:
Effects of salts on plants As soils become more saline, plants become unable to
2. According to the passage, two American scientists found "unexpected static in their radio
antennas". Cosmologists have developed models to advance their understanding of the universe.
The various discoveries and models used to attempt to explain the creation of the universe is an
example of which scientific principle? *
(25 Points)
O A. A scientific theory
ws
B. A scientific law
O C. A scientific conundrum
O D. Scientists replicate research findings
Pls help
Answer:
The answer is A scientific theory
Explanation:
I just did it
Based on the results of this study, what questions remain unanswered? How can these questions guide future research?
Answer: One of the biggest questions is, Can we replicate these results in other plants? So, there needs to be more research to determine whether this technique is effective in food crops. It’s not known what the protein PsbS does, even though it seemed to enhance plant growth. There should definitely be more research to find out how this protein is linked to plant growth and whether boosting this protein will affect growth in other types of plants. The researchers also noted that there are numerous other ways to make photosynthesis, and there are more than 100 chemical reactions involved in the process. Investigating other possibilities might be the key to improving crop yield in a wide variety of crops.
Explanation: same answer from edmentum.
Answer:
One of the biggest questions is, Can we replicate these results in other plants? So, there needs to be more research to determine whether this technique is effective in food crops. It’s not known what the protein PsbS does, even though it seemed to enhance plant growth. There should definitely be more research to find out how this protein is linked to plant growth and whether boosting this protein will affect growth in other types of plants. The researchers also noted that there are numerous other ways to make photosynthesis, and there are more than 100 chemical reactions involved in the process. Investigating other possibilities might be the key to improving crop yield in a wide variety of crops.
Explanation:
4. The pattern of inheritance in which more than one pair of genes affects a trait
is
Please answer fast ty