Question

Give an example of characteristics being used to determine how close to species are in evolution returns

Answer 1

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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Answer 2

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The relative closeness of two species can be determined using characters called the homologous structures. These are similar in different species, because of their inheritance from a common ancestor. For example, the limbs of human, frog, lizard and bird are similar in structure, though they perform different functions, suggesting their evolutionary relationship.