All of the following prevent pathogens from entering the human body except
a. red blood cells
b. tears
c. mucus
d. skin

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

How can an organ, such as the lungs, work for multiple body systems?

What is the term for a water wave that is created by an underwater earthquake