Which of the following is true about natural selection?
a.
natural selection is the only cause of changes in a species.
b.
natural selection usually causes a species to change suddenly.
c.
natural selection usually causes a species to change gradually.

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❖ The correct answer choice is C. Natural selection usually causes a species to change gradually.

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl