Orcas are endangered whales. Only about 80 individuals remain off the 1 point
coast of Washington State. Salmon are a source of food for orcas. Some
individuals are proposing that four dams in Washington State be removed
so that habitat areas for salmon will be increased. Those opposed to the
dam removals say that the dams provide low-cost hydroelectric power and
positively influence the local economy. This situation is an example of:

c should be the answer

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.

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.