A clade, sometimes given the rank of subkingdom, containing all animals that possess tissues, such as muscle or nerve tissue. Hence it excludes multicellular animals that lack tissues, notably the sponges (Porifera). Compare metazoa.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。