15 Which statement accurately describes the energy needs for photosynthesis and cellular respiration?
A Solar energy is needed for cellular respiration but not for photosynthesis.
B Chemical energy in the form of glucose is needed for both cellular respiration and
photosynthesis.
C Chemical energy in the form of glucose is needed for photosynthesis, and solar energy is
needed for cellular respiration.
D Solar energy is needed for photosynthesis, and chemical energy in the form of glucose is
needed for cellular respiration.
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U

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.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.