4. What threatens the health of coral reefs? (Select all that apply.) silt in the water that runs off from coastal land development
ocean water pollution
damage to coral from diving, boating, and fishing tourism
increased diversity of coral polyp species

Compare and contrast physical changes with chemical changes.

In 2002, the rare earth elements mine in mountain pass, california was closed because

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange