State one possible cause for the overall change in the carbon
dioxide levels shown in the graph

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.