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成体[1](adult)是躯体各部位已發育完成,具有生殖能力的動物個體;反之,与其相对者,称为幼体亚成体

在汉语中,除人类常称成人外,“成体”泛指各类植物[2][3]动物[4],甚至人类及其细胞[5]。但在无脊椎动物中,節肢動物門昆蟲綱的成体,特称为成虫[6](imago);由幼蟲發育至成蟲時,通常會經過變態的過程。有些昆蟲的幼蟲和成蟲形態差異很大,這些昆蟲經歷的是完全變態;有些的幼蟲則與成蟲差異不大,這些昆蟲所經歷的是不完全變態

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