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.
Succeed in Understanding Physical Science. Physical Science consists of the studies of Astronomy, Chemistry, Physics and Earth Science (coming soon). It is concerned with physical properties of objects, as opposed to the study of the characteristics of living things, as done in the Life Sciences. I'm Ron Kurtus, and I've always been interested in the Physical Sciences, including teaching the subject at the college level and working in the field in industry.