What is the name of the relationship in which only one species benefits and the other species is not harmed or helped?

Answer 1

Humans have many symbiotic relationships, such as the digestive system. We support many organisms that live on the food we ingest as well as help us digest foods that might ordinarily offer us very little nutrition if the intestinal flora wasn't present.

After a course of antibiotics, often many of these healthful little creatures are wiped out. This is why it is recommended to eat things like yogurt after finishing such medications to help to repopulate our digestive tracts, since yogurt has natural bacterial cultures that are quite good for us.

But by definition, symbiotic relationships mean that both parties benefit. As stated, your question describes a parasitical relationship, where one benefits at the expense of another.

A bloodsucker (leech) is ordinarily considered a parasite because it takes blood and gives nothing back to the host.

However just to make it interesting, bloodsuckers are used when people have subcutaneous haemorrhages (where blood is leaking inside the body, like an ordinary bruise, but dangerous) to help get rid of the trapped blood. An example is a compartment haemorrhage of the hand where internal bleeding can actually cause the tissue to die. The leeches have an anticoagulant to make the blood flow more easily, and can drain such an injury quickly before it results in permanent disability, up to, and including the loss of the whole hand.

Answer 2

A vulture is a perfect example of one that highly depends on other predators since they are scavengers. Once an animal is full of its prey a vulture then feeds off the rest of the prey. This is a good example of symbiotic relationships.

Answer 3

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