Here's why:
* Parasitism: A relationship where one organism (the parasite) benefits by living in or on another organism (the host) and causing harm to the host. The parasite relies on the host for food and often for shelter as well.
Examples of parasites:
* Ticks: Feed on the blood of mammals.
* Tapeworms: Live in the intestines of animals and absorb nutrients from their host's food.
* Mistletoe: A plant that grows on trees and steals water and nutrients from its host.
Important note: There are other types of relationships where organisms depend on each other for food, but they don't necessarily harm the host:
* Mutualism: Both organisms benefit from the relationship. (Example: Bees pollinating flowers)
* Commensalism: One organism benefits, while the other is neither harmed nor helped. (Example: Barnacles growing on a whale)
