Parasitism and parasites

Parasitism is not limited to the human world - as some might imagine - but it also exists in the animal world, and in the plant world as well. Many plants cannot obtain their own food, so they cannot, for the sake of their lives, take for themselves a host on which they live, parasitizing. Examples: There are many examples of this, as the dodder parasitizes clover, the halo parasitizes beans, and ...