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Plants and Animals
Zoology and Veterinary Medicine
Zoology: General
Zoology: General
Nonarticulate lampshells
Notacanthoidei
notochord
Nuclear membrane
Obdurodon
obligate
occipital condyle
Ocean sunfish
Octodontids
Odonata
omentum
ommatidium
omnivore
oocyte
operculum
Organelle
Ornithopoda
Orthoptera
Osteoglossiformes
Osteostraci
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Research Categories
Earth and Environment
History
Literature and the Arts
Medicine
People
Philosophy and Religion
Places
Plants and Animals
Science and Technology
Social Sciences and the Law
Sports and Everyday Life
Additional References
Articles
Daily