Glossary

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Subject:

the tough connective tissue membrane surrounding bones on the outside. It contains nerves and...

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the nervous system outside the brain and spinal column.

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rhythmical wave-like muscular contractions of a duct in order to cause movement of substances...

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the second set of teeth formed in mammals. In humans there are thirty-two permanent teeth.

pH
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a measure of acidity or alkalinity.

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