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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... which use hydrogen sulfide instead of water in their photosynthetic pathway:
CO2 + 2 H2S → CH2O + H2O + 2S
Some of these produce globules of sulfur as ...