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.
Youâll study such subjects as the chemical makeup of water, the oceanâs geology, marine mammals, fish, plants, and biological habitats. Marine biology majors study the creatures that live in the oceans. They also look at the habitats and ecological environments in which these organisms live. Marine biology majors study more than just plants and animals. For instance, they also study hydrothermal vents (geysers) in the ocean floor.