The chesapeake bay is an important natural resource. over the years, the number of oysters in the bay has declined dramatically, largely because of fishers who catch them and sell them as food. this has affected many other organisms that depend on oysters. this is an example of which type of short-term human-induced environmental change?
a. eutrophication
b. non-sustainable harvesting
c. nonnative species introduction
d. pollution

B. Non-sustainable harvesting.

Explanation:

Non-sustainable harvesting is a practice in which the resources are consumed in a way that not appreciable amount is left. This is a short term human induced environmental change. Such a change may last for a short period of time and the damge caused by the change will be recovered by the environmental conditions.

The oyster population which is being overexploited due to non-sustainable harvesting by fishing and depleted will recover in future with the few remaining members of the population. Hence, it is a short term human induce change.

the answer to your question is b

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.