E. Muscle Any or all of these layers just described may be involved in infections. 3. DEFENSES OF SKIN AND SOFT TISSUE (review Host Defense Against Bacterial Pathogens: Defenses of Body Surfaces, pp.7-8.) A. Skin is an important anatomic barrier â bacteria and viruses cannot penetrate intact skin.
Others work closely with environmental and other scientists to preserve and clean up the environment. Geoscientists usually study and work in one of several closely related fields of geoscience. Geologists study the composition, processes, and history of the Earth.
The study of how living things interact with each other and with their environment is called ecology. 1.the branch of biology that deals with the relations of organisms to onâ¦e another and to their physical surroundings.2.the political movement that seeks to protect the environment, especially from pollution.