Which of the following events is likely to precede adaptive radiation?
a. A few individuals fly over to an island in the middle of a river.
b. An avalanche of rocks falls off a mountain into a small lake.
c. A new species evolves gradually over long periods of time.
d. The ability to lay water-retaining eggs on land evolves.
e. A population is split by the upthrust of a new mountain range.
Ans: d. The ability to lay water-retaining eggs on land evolves.
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