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Science
California Science
Grade 4
e-Glossary
O
List of Words for Letter 'O'
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to hear the word and definition
observe
to use one or more of your senses to identify or learn about an object or event
omnivore
an animal that eats both plants and animals
open circuit
an electrical circuit with breaks or openings
ore
a mineral or rock containing a useful property or substance
organism
a living thing
oxygen
a gas that most plants and animals need to live