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.
1 Physical Science Questions When it comes to school and testing, a number of areas need to be evaluated to see how students and teachers are doing. 2  The idea is to monitor whether a curriculum is workingâ¦. 3  The Periodic Table of Elements Life is sustained by a number of chemical elements.