Most ocean food chains depend on phytoplankton as primary producers. Where in the ocean do phytoplankton live? O A. throughout all ocean waters, because phytoplankton can tolerate a wide range of temperature and light conditions
o
B. within about 200 meters of the ocean shoreline, because phytoplankton depend on nutrients that wash into the water from land
O
c. within about 200 meters of the ocean surface, because phytoplankton require light to survive
O
D. attached to shells along the ocean floor, because phytoplankton cannot float

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

c is the correct answer!