In an eight–cell embryo of an organism, the cells of the upper tier are aligned directly over the cells of the lower tier. which organism is it likely to be?

carbon atoms, hydrogen, oxygen, and nitrogen.

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.