Browse the glossary using this index

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G

grow

increase in size.

H

Habitat

the place where an animal or plant lives

Herbivore

animals that eat only plants

Hertz

unit of frequency measurement

I

Igneous rocks

rocks formed from molten (melted) material

immune

antibodies already in your blood recognise microbes and stop them causing disease

Impurities

unwanted parts of a mixture

Incident ray

light ray that hits a surface

infection

having a microbe present in your body, usually causes symptoms

infectious

being able to pass on a disease


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