Once food has reached the sea floor, currents carry this food and organisms filter it without having to use their own energy to go and get food. Another way organisms use energy is by coming out at night and rising to feed on upper-level organisms.
Physical Science redirects here. It is not to be confused with Physics. Physical science is a branch of natural science that studies non-living systems, in contrast to life science. It in turn has many branches, each referred to as a physical science, together called the physical sciences.
Physical Sciences Related Articles. 1  Online Courses in the Physical Sciences: Course Descriptions Several colleges offer physical science courses online. 2  Career Information for a Degree in Physical Sciences Degrees in physical sciences focus on the study of non-living systems and typically cover such areas as chemistry, geology, biochemistry,...