Question

19 multiple choice 1 point a biologist wishes to cite an example as evidence supporting one of the major tenets of evolutionary theory. which example best demonstrates the principle of natural selection? two species of small frogs, one blue and one red, live in the tropical rainforests of coastal panama. these frogs are a food source of local herons and other wading birds which seem to prey on both frog species in relatively equal numbers. there were hundreds of species of plants and animals living on a small, isolated volcanic island in the south pacific when the volcano erupted violently more than 50,000 years ago. all of these plant and animal species were completely eliminated in the eruption. there are two species of crabs that live on the white sand beaches of an island off the coast of jamaica: one has a pale shell color, the other a dark shell color. the pale - colored crabs have a lower predation rate and a higher rate of reproductive success. several species of ground sloths were native to the western u.s. between 20,000 - 30,000 years ago. one species is much better known than the others because it lived near mud flats, so its remains were more commonly preserved in the fossil record. clear my selection

Explanation:

Natural selection is the process by which organisms better adapted to their environment tend to survive and reproduce more successfully. In the case of the two - species of crabs, the pale - colored crabs have a lower predation rate (better adapted to the white - sand beach environment) and a higher reproductive success rate, which is a classic example of natural selection. The first option about frogs has no differential survival or reproduction based on traits. The second option is about mass extinction due to a volcanic eruption, not natural selection. The fourth option is about fossil preservation, not natural selection.

Answer:

There are two species of crabs that live on the white sand beaches of an island off the coast of Jamaica: one has a pale shell color, the other a dark shell color. The pale - colored crabs have a lower predation rate and a higher rate of reproductive success.