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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to improve her experimental investigation, dalila should add a row in which no fertilizer is used. by a having a contrasting row in which no fertilizer is used, she will have a control group that will her understand the effects of the fertilizer in the plant developments vs the development of the plant when no fertilizer is used.