Betta splendens is a common pet. In the wild, most males are red and most females are brown. However, breeders have bettas in a variety of sizes, shapes, and colors, as shown below.

Which term best describes the development of the bettas sold in pet stores?

A:artificial selection

B:natural selection

C:acquired trait

D:population genetics

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth

Individuals do not compete directly for resources, but are prey for the same predator

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.