The main aromorphoses of protozoa.

Aromorphosis is a change in the body’s adaptations for survival and development. In protozoa, such a striking change can be called the appearance of many cells in one organism. These organisms include coelenterates. Each group of cells has its own specific functions. Due to their multicellularity, they have ectoderm and endoderm (outer layer of cells and inner). Further, in round and flat worms, the middle layer of cells is formed – the mesoderm. This is another aromorphosis. As a result, organs and individual tissues arose.