3 Which of the following is always true of two organisms
in the same taxonomic class?
A They can breed with one another
B
They have certain physical features in common
С
They evolved at the same rate
D
They live in the same ecosystem

i am going to guess that it is co2.

enzyme speed up the reactions

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.