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.
Life Skills. The term âLife Skillsâ refers to the skills you need to make the most out of life. Life skills are usually associated with managing and living a better quality of life. They help us to accomplish our ambitions and live to our full potential.