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Give an example of characteristics being used to determine how close two species are in evolutionary terms.

Structure of forelimb in a frog, lizard, bird and horse is similar with similar bones which are modified to suit the function they perform. From this it can be safely assumed that they may have evolved from a common ancestor.

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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?

Can the wing of a butterfly and the wing of a bat be considered homologous organs? Why or why not?

Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?

What are fossils? What do they tell us about the process of evolution?

Heredity and Evolution

Give an example of characteristics being used to determine how close two species are in evolutionary terms.