One type of symbiosis is called mutualism. Which of the following is an example of mutualism? mangrove trees in swamps with long roots provide habitat for small fish which provide "fertilizer" to support the trees
lions hunt zebras and keep them from overgrazing the savanna
fleas bite dogs and other mammals, obtaining blood
birds ride on the back of wildebeest, eating the bugs that the wildebeest disturbs as it walks

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

Which description provides the best objective summary of the article in the passage?

In "the man in the water," what was the remarkable occurrence that rosenblatt reported?