1. Where do salts and minerals in the ocean come from? a. the amount of carbon dioxide tends to vary with depth
b. Erosion, hydrothermal vents, and volcanic activity
C. Erosion and temperature changes
d. currents change the pH of

d

Explanation:

D

Explanation:

answer; ///(b) it is composed of four protein chains and four heme groups;

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above