A biologist claims that during lake succession, fish such as trout are slowly replaced by fish such as bluegills. How must these fish be different for this claim to be TRUE? A. Bluegills must be larger than trout.

B. Bluegills must require less oxygen than trout.

C. Bluegills must require less nitrogen than trout.

D. Bluegills must have a greater population size.

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat