Scientists use a dichotomous key to help them identify and classify living things. the word dichotomous means

i am going to guess that it is co2.

answer: i cant find your answer. do u have another way i can answer it for you : )

explanation:

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.