Answer:
Populations have variation in traits due to random mutation, crossing over and environmental conditions.
The theory of evolution proposed that a series of catastrophes or mass extinctions followed by repopulation could explain why species change over time
There's been a lot of bad news for polar bears recently. In 2007, for example, scientists reported that if global warming continues unabated, the population could drop two-thirds by 2050.
Answer:
C
Explanation:
As carbon dioxide and oxygen and water(H2O) is involves in photosynthesis.
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