Organisms that share a recent common ancestor exhibit a higher degree of similarity in the amino acid sequences of shared proteins such as cytochrome c.
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The statement is true because species sharing a recent common ancestor have accumulated fewer genetic mutations, maintaining higher similarity in conserved amino acid sequences like cytochrome c.
Comparative biochemistry demonstrates that species with a recent common ancestor share high sequence homology in vital proteins like cytochrome c because minimal time has elapsed for neutral mutations to accumulate.
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Comparative Biochemistry in Evolution