Gas exchange is the process by which oxygen and carbon dioxide (the respiratory gases) move in opposite directions across an organism's respiratory membranes, between the air or water of the external environment and the body fluids of the internal environment.
niche. The function or position of a species within an ecological community. A species's niche includes the physical environment to which it has become adapted as well as its role as producer and consumer of food resources.
Analytical skills are the ability to collect, gather, visualize and analyze information in details. They include also the ability to see a problem or situation from different points of view. Analytical skills allow you to solve complex problems by making decisions in the most effective way.