A biologist studied a population of squirrels for 15 years. during that time, the population was never fewer than 30 squirrels a
nd never more than 45. her data showed that over half of the squirrels born did not survive to reproduce, because of both competition for food and predation. in a single generation, 90% of the squirrels that were born lived to reproduce, and the population increased to 80. which inference(s) about this population might be true? the amount of available food may have increased. the parental generation of squirrels made a peace treaty with it's predators. the number of predators that prey upon squirrels may have decreased. a and c could be true. a, b, and c could be true.
Natural selection occurs when one allele (or combination of alleles of different genes) makes an organism more or less fit, that it is able to survive and reproduce in a given environment. If an allele reduces fitness, its frequency will tend to drop from one generation to the next.
