Campbell Biologie May 2026

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.

Organisms possess features that help maintain internal stability, such as thermoregulation (control of body temperature). These physiological mechanisms ensure that an organism’s "internal environment" remains stable despite external changes. Campbell biologie

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,