WVGSA Grade 8 Science Practice Questions - West Virginia General Summative Assessment Grade 8 Science Exam

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The limb structures of a human arm, a bat wing, a cat leg, and a whale flipper contain identical arrangement of bones (humerus, radius, ulna, carpals). What do these homologous structures indicate?

These organisms evolved from a common ancestor with a similar basic limb arrangement These organisms live in identical ecological habitats These limbs perform identical mechanical functions These organisms developed these bones independently without any evolutionary connection

Correct Answer:

These organisms evolved from a common ancestor with a similar basic limb arrangement

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