Evolutionary unity is visible in shared anatomical traits, such as the skeletal systems of vertebrates. For example, the similar bone arrangement in the forelimbs of humans, bats, and whales represents a "feature" inherited from a common ancestor, even though they serve different functions like grasping, flying, or swimming.
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Every cell is enclosed by a selective plasma membrane that regulates the passage of materials between the cell and its environment. This shared feature is a hallmark of all life, whether prokaryotic (like bacteria) or eukaryotic (like plants and animals). Evolutionary unity is visible in shared anatomical traits,