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In biology, a is a distinctive aspect or trait of a living organism. Below are three types of features commonly discussed in the Campbell Biology textbook, ranging from molecular structures to evolutionary adaptations.
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, 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.