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.
TRY OUR LESSON DEMOS. Time4Learning offers an online, interactive high school Science curriculum that is organized into five courses: Biology, Earth/Space Science, Physical Science, Chemistry, & Physics. In each high school course, literacy is addressed in the activities in the form of vocabulary, comprehension, fluency, and writing activities.