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No. 153.Anole lizard
[Main Idea]
There are several possibilities to explain why same types of habitat specialists of anole lizard showed on different islands. And by providing the evidence of DNA sequences, researchers conclude that it's because each specialists evolved independently on each island.
[Structure]
P1: Call attention to a strange phenomina.
Anole lizard species on islands have different habitats and shapes. But some similarities in habitat, shape and behavior exist across different islands.
P2: Provied possible explanations.
1. Evolved just once.
a) Ancestral species traveled and colonize other islands.
b) The islands are once connected and then separated.
2. Evolved independently.
P3: How to know whether they evolved just once or independently?
1. Once -- more closely related on different islands.
2. Independently -- more closely related on the same island.
P4: DNA sequences led researchers to conclude that it's the second one.
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