I think what you're asking is genetics?
An autotroph is an organism that can make its own food.
Tapeworms are known to feed off of their hosts to complete their life cycle. This type of symbiotic relationship is called parasitism. Parasitism is defined as the type of symbiotic relationship wherein only one of the two interacting organisms benefit, at the latter organism's expense. Parasites could either be found inside or outside the host's body. Tapeworms are internal parasites.
Because ATP is phosphate-phosphate bond so ATP can store energy for use by cells :)))
i hope this be helpful