Flat and round parasitic worms live in conditions of constant oxygen deficiency. At what stage of metabolism and how do they get energy?

Flat and round parasitic worms live in conditions of constant oxygen deficiency. At what stage of metabolism and how do they get energy? What substance is the source of this energy?

1) Parasitic helminths produce energy through glycolysis.
2) The source of glucose is glycogen, which is stored in worms.
3) In the process of glycolysis, ATP is synthesized, which is the main source of energy

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