Blake and Angel are scientists. Blake studies how plants grow. Angel studies how to build things. Why do Blake and Angel use different kinds of investigations? A. because they made a mistake B. because they do not like each other C. because they study the same things D. because they are asking different questions the answer is D

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.