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1. were any scientific investigations conducted for proposing the clements successional theory?

2. was the clements theory tested or simply expected?

3. were there any objections to the clements theory?

4. has the clements theory been subjected to peer review and publication?

5. did the scientific community accept the clements theory?

there's pretty much nothing useful about it online or answers to these questions, so

the answer is 1. photosynthesis. glad to

the answer is c. have a great day; )

the right option is; decreased genetic variation  

decreased genetic variation describes the effect of this environmental change.

genetic variation is the naturally occurring genetic diversities or differences between organisms of the same species in a population. genetic variation allows the survival and adaptability of a species when they encounter changing environmental conditions. when an endangered species reduces, it loses genetic variation which may not be restored even if the species rebound and will only be recovered through the gradual collection of mutations over many years.