Answer:
The proportion of oxygen went up because of photosynthesis by plants. The proportion of carbon dioxide went down because: it was locked up in sedimentary rocks (such as limestone) and in fossil fuels. it was absorbed by plants for photosynthesis.
Explanation:
Your answer would most likely be letter
B. Biosphere
This is because meiosis <span>produces spores that are used for reproduction and can form similar copies to </span><span>the parent cell.</span>
photosynthesis!!!
Leaves from the plant absorb light from the sun. Leaves of plants also absorb the air that people breathe out, carbon dioxide