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(also called a glacial age) a long period of low temperature on Earth, during which large sheets...

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the last part of the mammalian small intestine.

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the actions of the body's immune system that work to fight infections or disease.

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the parts and processes of the body that recognise and fight pathogens, such as viruses and...

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when the body makes its own antibodies when deliberately exposed to a dead or weakened pathogen...

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