Answer:
Plants and animals use oxygen to respire and return it to the air and water as carbon dioxide (CO2). CO2 is then taken up by algae and terrestrial green plants and converted into carbohydrates during the process of photosynthesis, oxygen being a by-product.
Explanation:
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Answer:
the answer is (A) a powerhouse
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Answer:c. genetic sequencing
Explanation:
The earth has been changing long before humans, including the organisms that have lived on earth and than for example the supercontinent pangaea existed