Evolution Evidence

The theory of evolution explains how species change over time, with body structures providing clues about their ancestry. Some structures were modified to perform new functions, while others became less useful over time.

Certain body parts, called homologous structures, look alike because they come from a common ancestor, even if they now serve different functions.

For example, the limbs of mammals like bats, lions, and whales have similar bone structures despite being adapted for flying, running, or swimming.

This suggests they evolved from a common ancestor with a comparable limb structure.

On the other hand, some body parts lose their original purpose over time but remain. These are called vestigial structures and provide further evidence of evolution.

For example, ostriches have wings but do not fly. Similarly, whales have pelvic bones, indicating that their ancestors once had legs and walked on land before adapting to life in the ocean.

Likewise, penguin wings, now used as flippers for swimming, suggest that their ancestors likely used them for flying.