What effect does the heating and cooling procedure have on the bacteria present in the soil samples? 5. what is the source of the bacterial colonies in the heated samples?

my teacher would say no s

d. changes in climate and historical records

hope this

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.