1. Metazoa include all animals except sponges and protozoa.
多细胞动物包括除了海绵动物和原生动物之外的所有动物。
2. The study of metazoa is essential for understanding the diversity and evolution of animal life.
对多细胞动物的研究对于理解动物生命的多样性和进化是至关重要的。
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