Which of the following is NOT a correct base pair?

A-C
T-A
C-G
A-T

A-C

Explanation:

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Remember these are the complementary base pairs

Adenine and Thymine (so the 2nd and 4th one are correct base pairs)

Cytosine and Guanine ( so the 3rd one is a correct base pair)

Hence, A-C would be the incorrect base pair because like stated previously Adenine pairs with thymine not cytosine

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.