When we say that there are similarities between the oxygen isotopes of the Earth and the Moon, what are we referring to?   a Varieties of oxygen atoms that have the same numbers of protons, but different numbers of neutrons   b Varieties of oxygen atoms that have the same numbers of electrons, but different numbers of protons.   c Varieties of atoms that include various types of oxygen, nitrogen, and carbon.   d Varieties of oxygen atoms that have the same numbers of neutrons, but different numbers of protons.

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A: This statement is true.

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Q: How can fossils provide evidence that chickens can be descendants of dinosaurs?

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