Tapeworms are flatwormsparasitic in the digestive tract of vertebrates. They consist of a round head, called "scolex", which has hooks, and a tape-shaped tail divided into segments, each of which has reproductive[?] organs.
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... is zero and it is impossible to divide by it.)
The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula should be understood as "either of thos ...