All tapeworms are internal parasites of humans and vertebrates. To preserve their species, they have complex development cycles. For example, a bullish tapeworm.
The cow can eat tapeworm eggs along with the grass. In its intestines, a larva with 6 hooks emerges from the eggs. It bores the walls of the intestine and goes out into the blood, which delivers the larva to the muscles, where it turns into a Finn.
If a person eats infected, poorly cooked meat, then an adult worm develops from the Finns in his intestines.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.