Answer:
They have a backbone, most use legs,wings,or fins for movement.
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The answer is Probability
Genetics experiments on the breeding of plants or animals are based on the laws of probability. They are based on the laws of segregation. Probability will determine what you are likely to get though.
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That is known as the process of Osmosis
Hunters and pochers put the Marine Iguana at the very edge of extinction and that is why they are put on the endangered list