Answer:
True
Step-by-step explanation:
Natural selection allows for individuals to pass down helpful characterics or genes to their offspring to ensure the survival of a species. For example, giraffes used to have much smaller necks but a few were slightly longer. The giraffes with longer necks survived at greater rates than the ones with normal necks because it was easier for them to reach leaves. They passed the longer neck genes into their offspring, who also had an easier time getting food. The result was giraffes ended up having long necks because it increased their survival while the short neck giraffes died out because that gene was a disadvantage to them. There can also be genes that are no longer needed for a species but it doesn't impact them whatsoever. Mutations can cause various genes to appear in a species which can be either helpful, neutral, or harmful. If it is harmful, the mutated individuals will likely die out and the mutation will not be passed on to future generations.