Structures that are reduced in size and no longer have a function are called

Cells that contain no nucleus

Structures that, even though their functions are different, have similar internal structures

The earliest organisms on earth

Natural selection that favors an extreme form of a trait

An adaptation that helps an organism blend in with its environment

Features that appear similar but are very different on the inside are

A group of organisms of a species living in an area

When a species looks like another species to protect itself

Evolution that results in non-related organisms that resemble each other

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