The Canary Islands are seven islands just west of the African continent. The islands gradually became colonized with life (plants, lizards, birds, etc). Three different species of lizards found on the islands are similar to one species found on the African continent (Thorpe & Brown, 1989). Because of this, scientists assume that lizards traveled from Africa to the Canary Islands by floating on tree trunks washed out to sea.
According to the theory of natural selection, where did the variations in body size in the three species of lizards most likely come from?
a. The lizards needed to change in order to survive, so beneficial new traits developed.
b. The lizards wanted to become different in size, so beneficial new traits gradually appeared in the population.
c. Random genetic changes and sexual recombination both created new variations.
d. The island environment caused genetic changes in the lizards.
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