The human body is made up of several systems. Each of these systems works
together to maintain homeostasis in the
organism. For example, the respiratory
system takes in oxygen and the oxygen is
transported through the body by the
cardiovascular system. The human body is
an example of
A. an open system.
B. a closed system.
C. a neutral system.

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 feature would you expect to find in a population in which sexual selection depends on male competition?

Which statement best addresses the differences in sex cell differentiation between the red-eared slider turtle and a human?