Due to the fact that the white blood cells can change their shape and squeeze in through smaller parts of the blood flow, they have the ability to protect the immune system from any infections. They able to move easily in the blood flow, meaning that they can stop any infections or illnesses that would have came the person's way. This is why a person that has more white cells is not ill that often because there are more cells able to reach that particular place of infection.
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o In the chemical bonds between adenine and ribose
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Pythons and boa constrictors have tiny hind leg bones buried in muscles toward their tail ends. Such features, either useless or poorly suited to performing specific tasks, are described as vestigial. ... Vestigial legs are a clue that snakes descended from lizards.
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Advantage - having natural automatic antibodies and defences to defend the body from any unknown organisms invading or intruding.
disadvantage -<span>The bodies of mammals are always maintaining the temperature through processes which is why constant food consumption is necessary.</span>
