Question

blue flying fish live in the upper layers of the ocean. blue flying fish have enlarged pectoral fins that enable them to glide for 400 meters above the ocean surface and appear to fly. which statement best describes how natural selection led to enlarged pectoral fins in blue flying fish? fish were able to glide out of the ocean and into other bodies of water to mate with other species. fish were able to live both on land and in the water as a result of their larger pectoral fins. fish with enlarged pectoral fins were able to glide out of the ocean to escape predators, increasing their fitness. fish changed their dna to express enlarged pectoral fins, changing the allele frequency of the population.

Explanation:

Natural selection favors traits that increase an organism's fitness, such as the ability to escape predators. Gliding out of the ocean with enlarged pectoral - fins would give blue flying fish a survival advantage. The first option about mating with other species is not related to natural selection for enlarged pectoral fins in this context. The second option about living on land and water is not the main driver for the evolution of enlarged pectoral fins. The fourth option about changing DNA to express a trait is incorrect as natural selection acts on existing genetic variation, not on a purposeful change in DNA.

Answer:

Fish with enlarged pectoral fins were able to glide out of the ocean to escape predators, increasing their fitness.