The observation that most aquatic animals,like fish,penguins,and whales all have streamlined bodies and fins or flippers for steering are a result of:

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The observation is an example of convergent evolution, where unrelated species develop similar adaptations due to similar selective pressures in similar environments. In aquatic environments, the ability to swim quickly and maneuver efficiently is advantageous, hence many aquatic animals have evolved streamlined bodies and fins or flippers for steering, despite not being closely related. Sexual selection, artificial selection, analogous selection, and vestigial selection do not explain this observation.

The Observation That Most Aquatic Animals,like Fish,penguins,and Whales All Have