What is the capacity of the cube in liters?

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

Are the earth's ocean floor and continents the same age geologically? why or why not?

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?