Integrins are of vital importance to all metazoans , from humans to sponges 从人类到海绵，粘合素对所有多细胞动物来说都至关重要。
2.
Soil nematodes are the most abundant metazoan , which have various types of life - history and feeding habits , and play a key role in soil food web 线虫作为土壤中数量最丰富的后生动物，其生活史和取食类型多样，在生态系统中发挥着重要作用。
3.
It was observed respectively by optical microscope and sem ( scanning electron microscope ) that bacteria , filamentous fungi , protozoan and metazoan were adhered on the surface of the sludge , and the microorganism of the floe in the forms of micro - colones 光学显微镜和扫描电子显微镜观察发现，污泥表面附着有各种球菌、杆菌、丝状菌以及原、后生动物，凝絮体中微生物以微群落形式分布。
