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Eumetazoa
Eumetazoa , subkingdom of the animal kingdom comprising all animals except the sponges and the wormlike mezozoans (see Mezozoa ).
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animal-rights movement
animal-rights movement diverse individuals and groups concerned with protecting animals from perceived abuse or misuse. Supporters are specifically concerned with the use of animals for medical and cosmetics testing, the killing of animals for furs, hunting for pleasure, and the raising of livestoc...
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Bryozoa
Bryozoa , name of a phylum, in older systems of classification, that included the invertebrate animals now classified in the phyla Entoprocta and Ectoprocta . The term bryozoan (or moss animal) is still commonly used for members of the Ectoprocta.
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zodiac
zodiac [Gr. zoion =animal], in astronomy, zone of the sky that includes about 8° on either side of the ecliptic . The apparent paths of the sun, the moon, and the major planets all fall within this zone. The zodiac is divided into 12 equal parts of 30° each, each part being named for a co...
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neuron
neuron specialized cell in animals that, as a unit of the nervous system , carries information by receiving and transmitting electrical impulses.
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Metazoa
Metazoa , subkingdom of the animal kingdom comprising the multicellular animals in the traditional two-kingdom system of taxonomic classification, in which living organisms were considered to be either plants or animals. Metazoa included all animals except the protozoans, formerly classified as in t...
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omnivore
omnivore (diversivore) A heterotroph that feeds on both plants and animals, and thus operates at a range of trophic levels....
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protoplasm
protoplasm Living contents of a plant or animal cell. It includes both the nucleus and the cytoplasm of cells....
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carnivore
carnivore , term commonly applied to any animal whose diet consists wholly or largely of animal matter. In animal systematics it refers to members of the mammalian order Carnivora (see Chordata ). This large order is divided into two suborders, the Fissipedia, or land carnivores, and the Pinnipedia...
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vivisection
vivisection , dissection of living animals for experimental purposes. The use of the term in recent years has been expanded to include all experimentation on living animals, rather than just dissection alone. The practice contributed to the outstanding progress that was made in the 17th cent. by Wil...
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