Unit 10: Topic 2

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Multiple Choice

Which statement best explains why homologous structures support the theory of evolution?

• They are always used for the same function in every species.

• They show that animals can develop new features suddenly.

• They suggest different species inherited traits from a common ancestor.

• They always appear during adulthood.

Multiple Choice

Which of the following pairs are analogous structures?

• Whale flipper and human arm

• Bird wing and butterfly wing

• Cat paw and lion paw

• Fish fin and frog leg

Multiple Choice

What does the presence of vestigial structures, like a whale’s pelvis bone, suggest?

• Whales are part reptile.

• Whales once had ancestors that used that structure.

• Whales evolved from birds.

• The pelvis is still needed for swimming.

Multiple Choice

What do similarities in the early embryos of fish, birds, and mammals suggest?

• They will grow up to be the same species.

• They were all created independently.

• They share a common ancestor.

• Their DNA is completely identical.

Multiple Choice

Which evidence is used in molecular biology to support evolution?

• Size of bones

• Wing shape and strength

• Coloration of fur or feathers

• DNA and protein sequence similarities

Match

Match the following

• Early developmental stage of an organism

• Physical remains or impressions of organisms from the past

• Structures that were functional in ancestors but reduced in current species

• Similar structures inherited from a common ancestor

• Structures that serve the same function but have different evolutionary origins

Embryo

Fossil record

vestigial Structures

Homologous structures

Analogous structures

• Embryo

• Fossil record

• vestigial Structures

• Homologous structures

• Analogous structures