How does homologous and analogous structures serve as evidence to support common ancestry, descent with modification and evolution (organisms changing slowly over time)? 6-7 sentences.

Homologous structures provide evidence for common ancestry, while analogous structures show that similar selective pressures can produce similar adaptations (beneficial features). Similarities and differences among biological molecules (e.g., in the DNA sequence of genes) can be used to determine species' relatedness.

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answer: "circumcision is a common procedure in which the skin covering the tip of the penis is surgically removed."