What is an embryo?
A. An early stage of development of a multicellular organism.
B. A sex cell that begins to grow and diversify.
C. The genome of an organism before birth.
D. The fluid sac surrounding a developing organism in its earliest stages.
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How is comparative embryology used as evidence for evolution?
A. The similarities in development across organisms show how they are related.
B. The development of embryos shows evolution occurring in organisms before birth.
C. The similarities of embryos shows that all organisms used to once look like each other.
D. Comparative embryology is not used as evidence for evolution.
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