The answer will be parasite.
The organism a parasite lives on is called a "Host".
it lives off of the blood of its host.
a parasite is an organism that depends on another living organism for its survival. plants such as mistletoe and organisms such as leeches are examples of parasites
they essentially cant, they must suck blood off another organism to live
The host is the organism for which a parasite lives off of.
A host is an organism that the parasite lives on. In other words the parasite may use the host's resources in a negative way. For example: A tick living off the blood of a human. The tick is the parasite and the human is the host. The tick lives off the blood of the human.
When an organism lives off of another organism, it is called parasitism. The organism benefiting is the parasite, while the one being harmed is the host.
Parasites live off of living organisms. They include things such as lice, fleas, and fungus. Saprophytes, on the other hand, live off of decaying matter, and would include fly larvae (maggots).
Leeches drink the host's blood.
Parasitism .
Leeches are from the subclass Hirudinea and a kind of segmented worm but differ in significant ways. Leeches eat a prey on small invertebrates, and they use their interior suckers to feed on their host.
The tapeworm feeds off the host organism and hurts this body. This means the tapeworm benefits, but the host organism is hurt from the rlationship.