Shivering and sweating are two techniques that mammals use to a) adapt to the temperature
b) develop a rise in body temperature
C) maintain homeostasis
d) use excess energy

d. groundwater flows through the subsoil and deposits minerals.

the contamination

we are putting to many trash.

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.