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Ancestral versus shared derived characters involving morphological traits.
Wood first appeared in plants called progymnosperms.
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
Arthroscopic surgery. In this illustration, the knee joint is undergoing surgery with a specialized
Alternative splicing of pre-mRNA for a muscle protein called α-tropomyosin
A thin cleft, called the synapse, separates one cell from another.