Reticulate bodies are often termed "energy parasites" because they lack an enzyme system for producing ATP.
Parasites get their energy and nutrition from their host. They cannot make their own energy, so they don't have chlorophyll.
Humans aren't parasites because parasites are living things that suck the life out of another animal that it infected, called a host. Since humans get their energy from foods they eat and not energy they leeched from another living thing, they are not classified as parasites.
Parasites
parasites
decomposers and parasites
We don't make our own food. We to have to eat other organisms to make energy for our bodies.
radiant energy
parasites
Yes, chlamydia get their ATP from the host cell.
heat
energy
Engines, motors, our bodies, etc use chemical energy.