In 1668, Francesco Redi performed a series of experiments on spontaneous generation. In one experiment, he began by putting similar pieces of meat into eight identical jars. Four jars were left open to the air, and four were sealed with lids. The exposed meat attracted flies, he monitored the jars and recorded whether or not maggots (young flies) appeared in the meat. What must a hypothesis be to be a viable hypothesis? It has to be testable. State a hypothesis that Redi would have been testing with his initial experiment where he was using open and sealed jars.

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.