Browse the glossary using this index
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OligochaetaName of the class of annelids to which earthworms belong, characterized by having setae. | |
OptimalMost favorable conditions, such as for growth or for reproduction. | |
OrganicPertaining to or derived from living organisms. | |
Organic matterMaterial which comes from something which was once alive. | |
OrganismAny individual living thing. | |
OxygenGaseous element in the earth's atmosphere essential to life as we know it. | |