10. What does pH measure? the total number of acid molecules in solution
the concentration of oxygen atoms in solution
RAISON
the concentration of hydrogenions in solution
Te
the total number of base molecules in solution

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.

the answer is d. embryo