Glossary
To enable young readers to understand the technical words necessarily used in the text only popular definitions are given.
Abdomen: the part of an insect lying behind the thorax.
Acid: a chemical name given to many sour substances. Vinegar and lemon juice owe their sour taste to the acid in them.
Adult: a person, animal, or plant grown to full size and strength.
Ammonia (ammonium): a compound of nitrogen readily usable as a plant food. It is one of the products of decay.
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