A population of plants is growing in a nice, moist rain forest. All of the plants have equally thin, broad leaves that lose water quickly (which is ideal in this environment). Which of the following could add a new heritable variation providing thicker, tougher leaves that would make the plants more drought-resistant?a) Mutation: a change to DNA in a sperm or egg could produce a new gene that controls leaf thickness.b) Both mutations or gene flow could allow this to happen.c) Gene flow: pollen from a nearby population of plants with thicker leaves could fertilize a flower and bring a new allele into the gene pool.d) Natural selection: survival of the fittest could create a new genetic adaptation like thicker leaves if it was needed.e) Environmental change: a drought could stress the plants, making them grow thicker leaves that they would pass to their offspring in order to survive.

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