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.
Â© 2016 Gwen Dewar, Ph.D., all rights reserved. Spatial skills predict a young personâs achievement in science, technology, engineering, and mathematics. They are crucial for the mechanic, visual artist, architect, and surgeon. Yet traditional schooling does relatively little to foster the development of these abilities, and that's troubling.