Which characteristic on these two pages do you think best identifies an object as a living thing? Explain your choice.

Which phrase best describes surface currents? 1. up-and-down ocean movement caused by wind 2. waves that hit the shore at an angle and transport sand 3. streams of warm water flowing through the ocean and caused by wind 4. waves that approach the shore and cause their crests to fall into their troughs

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

The model illustrates a process by which a substance is taken up by a cell