Corals live in colonies in shallow water in the tropics. They participate in a mutualistic relationship with algae. The algae live inside the coral. Based on this information, how do you think the coral and the algae benefit from this relationship?

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

Label the following as inner or outer planets; a) has 67 moons made mostly of hydrogen and helium b) has rings c)no moons, high volcanic activity d) known as the red planet, has 2 moons e) very thin atmosphere, moons or rings

Can an organism fill more than one trophic level?