Heredity and Evolution
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Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species?

The genetic makeup of humans may be slightly different in different races of people, but there is no reproductive isolation. Reproductive isolation differentiates one species from the other. Human beings different in size, colour and looks can marry among themselves and produce fertile offspring and thus they are considered to belong to the same species.
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    Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
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    Can the wing of a butterfly and the wing of a bat be considered homologous organs? Why or why not?
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    What are fossils? What do they tell us about the process of evolution?
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