Give examples for evolution of stages.class 10
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Evolution by stages
Evolution by eyes
Eyes are the organs of sight. Eyes are complex in vertebrates like humans. They did not evolve all of a sudden, but evolved gradually. In earlier forms of organisms like euglena, a small eye spot was seen hidden.

Flatworms have eye spots to detect light. These eyespots gave survival advantage to flatworms. Gradually, with time, eyes developed. All vertebrates (mammals) have similar basic structure of eye
Evolution by eyes
Eyes are the organs of sight. Eyes are complex in vertebrates like humans. They did not evolve all of a sudden, but evolved gradually. In earlier forms of organisms like euglena, a small eye spot was seen hidden.

Flatworms have eye spots to detect light. These eyespots gave survival advantage to flatworms. Gradually, with time, eyes developed. All vertebrates (mammals) have similar basic structure of eye
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