Why is it necessary for oceanographers to analyze river pollution levels?

bc blah

explanation:

bc blah

the correct answer is d

b a mature ovary of a plant.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.