Heterotrophication includes parasitism, saprophy, predation and so on. So parasitism is a part of heterotrophy, and heterotrophy includes parasitism.

Introduction:

Heterotrophs refers to those organisms that need to use external organic matter to synthesize their own organic matter to provide energy. Their lifestyles are: parasitism, predation, autotrophic and saprophytic. Such as animals, fungi and most bacteria.

Heterotrophs is the opposite of autotrophs. Autotrophic organisms refer to organisms that can transform inorganic substances into organic substances by using light energy (photoautotrophic) or chemical energy of inorganic environment (chemoautotrophic). Such as plants and some bacteria.

Parasitism is a way of life. Some organisms feed on others to get the nutrition they need, which is harmful to the health of the host. Such as roundworms and viruses.

Some creatures live in the corpses and excrements of other creatures and get the necessary substances from them. This is saprophyte. Unlike parasitism, saprophyte does not feed on living things. Such as most bacteria and fungi (such as mushrooms).

Two kinds of creatures live together, mutual benefit, and neither can live without the other. This is * * *. Lichens, for example, are living organisms of fungi and algae, and leguminous plants and rhizobia also belong to living organisms.