Which is an explanation of the importance of carbonates for marine life? Select all that apply.

Carbonates form part of the skeletal structure of corals, sea urchins, and other aquatic life.
Carbonates supply calcium carbonate, a critical building block for the shells of oysters and clams.
Carbonates decrease the pH of the ocean, which improves the health of marine organisms.
Carbonates increase the ocean’s solubility so that marine organisms have adequate oxygen for survival.