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.
Ecology is the scientific study of interactions among organisms and their environment. It is an interdisciplinary field that straddles biology, geography, and Earth science. Objects of study include interactions of organisms with each other and with abiotic components of their environment. Topics of interest include the biodiversity, distribution, biomass, and populations of organisms, as well as cooperation and competition within and between species. Ecosystems are dynamically interacting syste