Answer:
Number of protons plus the number of neutrons.
Explanation:
Most of an atom's mass is in its nucleus. The nucleus is made up of protons and neutrons.
<span>productivity 20 character.
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The organelle the question is referring to is called the chloroplast. I hope this helps; have a good evening!
Answer:
The answer should be C: mostly in the 20th century
Explanation: