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INVERTEBRATES
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- trilobite
- triradiate
- triton
- trochophore
- trophozoite
- trypanosome
- tsutsugamushi disease
- tube foot
- tube worm
- tubifex worm
- tubificid
- tunicate
- turbellarian
- two–spotted spider mite
- umbo
- umbrella
- unarmed
- uncinate
- uncus
- underbody
- univalve
- urchin
- uropod
- uterus
- valve
- varroa mite
- veliger
- velum
- ventr-
- ventral
- Venus's flower–basket
- verge
- vermi-
- vermicular
- vermiculate
- vestimentiferan
- vinegar eel
- volute
- vorticella
- water bear
- water bug
- water flea
- water–vascular system
- weave
- web
- wentletrap
- wheel animal
- whelk
- whip scorpion
- whipworm










