Describe the size of the coloring and the nature of the movements of free-living roundworms.

Roundworms are parasitic roundworms. Accordingly, they live in the organismic environment, that is, inside the body of animals. Most often they live in the intestines, but sometimes roundworms can enter other organs and muscles. The length of female roundworms can reach 40 centimeters. Males are smaller than females by an average of 15 centimeters. Mostly roundworms are white. In the intestines, they constantly move against the movement of food so as not to leave the body along with processed substances during digestion.