The relationship between the hagfish and the whale is that of

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

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

2polnis which of the following is an advantage of an in vitro experiment?me