A fraction of the original green frog population survives to reproduce and generate a new population. If the survivors of the original population survived by chance, then this event is an example of:

A fraction of the original green frog population survives to reproduce and generate a new population. If the survivors of the original population survived by chance, then this event is an example of genetic drift.

Explanation:

Genetic drift is the change in allelle frequencies in a population due to chance events, more likely to occur in  small populations.Frequency of traits changes in a population due to chance events (random change). Unlike natural selection, which favors beneficial traits, genetic drift is random and can cause an increase in traits that are beneficial, detrimental, or neutral.

Hence,A fraction of the original green frog population survives to reproduce and generate a new population. If the survivors of the original population survived by chance, then this event is an example of genetic drift.

the answer is d.) homologous; have mammary glands

b is the correct answer