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:
<span>When an atom loses or gains electrons, it becomes an ion.
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Answer:ANSWER IS OPTION 'B'
Global climate is changing due to burning of fossil fuels and deforestation.
Answer:
fur with black hairs
Explanation:
Its because B denotes the dominant gene which express itself and supress the recessive one (b)