what are two abiotic factors that might account for the differences in productivity among the land ecosystems in the table?

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

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity

The function of the excretory system is to control homeostasis and