The digestive system of arthropods works not far from how a human being eats and digests food. They have appendages close to their mouths that they utilize to let the food move into their body, whether it's plant matter or another living thing. With each individual kind, the parts of their mouth varies depending on the type of food they eat.
I think the correct answer is cellular respiration. It is the set of reactions that take place inside the cells in order to convert energy from food especially from glucose into a unit of energy which is ATP and then eventually release wastes. Hope this helped.
Parasitism: One organism (the parasite) gains, while the other (the host) suffers. I think.... either that or it's
Commensalism: only one species benefits while the other is neither helped nor harmed. ... Almost positive that its Parasitism tho