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.
A well-established population of lizards is made up of hundreds of individual lizards. On an island, all lizards in a lizard population are likely to:
a. be indistinguishable, since there is a lot of interbreeding in isolated populations.
b. be the same on the inside but display differences in their external features.
c. be similar, yet have some significant differences in their internal and external features.
d. be the same on the outside but display differences in their internal features.
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