You're right, it is D.
A theory can be changed if evidence is found that contradicts the current theory.
This cycle is called the carbon cycle.
The answer would be: relatively constant environmental conditions
When the environment condition is changed, the organism need to changes too. If the organism reproduced asexually, their genetic material of the offspring would be identical without change. This makes asexual reproduction couldn't produce a different offspring.
Sexual production will produce a various genetic material that might turn the changes into beneficial condition.
B.) speeds up chemical reactions
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Answer:
No, as the growth into an adult requires the process called cell division and will continue on until your death
