APP The breakdown of complex organ-ic foodstuffs by enzymes into simpler solublesubstances,which can be absorbed and as-similated by the tissues. In most animals (e.g. vertebrates and arthropods) it is extracel-lular,occurring in an alimentary canal or gut in......（本文共 594 字） [阅读本文] >>
说明： 本文档由创作者上传发布，版权归属创作者。若内容存在侵权，请点击