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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

thing go
a separate and self-contained entity

part, piece go
a portion of a natural object

body part go
any part of an organism such as an organ or extremity

system go
a group of physiologically or anatomically related organs or parts

vascular system go
the vessels and tissue that carry or circulate fluids such as blood or lymph or sap through the body of an animal or plant

water vascular system
system of fluid-filled tubes used by echinoderms in locomotion and feeding and respiration

noun.animal

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