Which statement illustrates the difference between a chemical reaction and a nuclear reaction?
A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.
A nuclear reaction releases less energy per gram and appears to violate the law of conservation of mass.
A nuclear reaction releases more energy per gram but does not appear to violate the law of conservation of mass.
A nuclear reaction releases less energy per gram but does not appear to violate the law of conservation of mass.

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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.