List the signs of complication in the organization of flat, round, and annelid worms.
| March 25, 2021 | education
On Earth, worms appeared in the following sequence: flat – round – annelid.
For the first time in flatworms, real tissues, organs and organ systems such as digestive, excretory, musculoskeletal and genital, as well as sense organs (eyes, tentacles) appeared.
Roundworms have a primary body cavity filled with fluid, and an anus in the digestive system.
In annelids, there is a secondary body cavity, separated by the epithelium, and the circulatory system.
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