Which of the following is an example of homologous structures?

a. whale hip bones.
b. embryos of fish and birds both make gill slits.
c. mice and chicken differ by only 25 amino acids when they make hemoglobin protein.
d. rabbits and birds have the same bones in the same order in their forelimbs, even though they use them for different purposes.

The answer would be D. The definition of a homologous structure is an organ or body part that appears in different animals and is similar in structure and location, but doesn't necessarily share the same purpose. The birds and rabbits have similar bones in their forelimbs, but one uses them to run and other uses them to fly.

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