Humans, dogs and goldfish are examples of ____. Different species have different ____ from each other. For example, dogs have ____ and humans do not. Dogs have fur, but goldfish have ____. The individual members of a species also have ____ in characteristics. For example, humans have different ____ eyes, and dogs have different length tails. This means that no two members of a species are ____. The differences between the individuals in a species is called ____. Variation helps a species to ____, by causing individuals of a species to be ____ and physically ____.

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