I think it is A but I am not completely sure
Answer:
The majority of an atoms' mass comes from the protons and neutrons that make up its nucleus. Electrons are the least massive of an atom's constituent particles, with a mass of 9.11 x 10-31 kg and a size too small to be measured by current techniques.
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According to Charles Darwin what is one reason that not all organisms survive in nature?
<span>B. There are more organisms born than resources can support.</span>