First, we have to define relationship.
A relationship is how we view the meaning of two people or things viewed together. There is a relationship between the sun and the moon. We see these in terms of relative size, proximity and behavior (the moon orbits the Earth, which orbits the Sun).
There is a relationship between an employer and employee.
There is a relationship between a brother and sister.
We seek to couple with another human being and start a romantic, sexual and familial "relationship."
Each of these serves to give us that which we do not contain. We cannot give ourselves companionship. We cannot give ourselves something by which to compare ourselves/pattern ourselves by merely existing on what we contain.
We benefit from relationships in many ways. We get enjoyment, emotional nourishment and support, the exchange or sharing of resources, the possibility of procreation and the opportunity to learn from one another.
A mutually beneficial relationship between two biotic (living) organisms is called a symbiotic relationship.
beneficial because it keep the ecosystem in balance
It is a parasitic relationship. That means that the relationship is beneficial to the flea, but harmful to the dog.
A "mutually beneficial", professional relationship.
It is where both species benefit the other equally.
A parasitic relationship, which you describe, is not symbiotic. A symbiotic relationship is one which is beneficial to both entities.
Agriculture
Yes, a parasitic relationship is beneficial to the parasite but not to the host. The host usually suffers because of the parasite
In nature a relationship between two organisms of different species is called symbiotic. These relationships can be both beneficial and harmful to one or the other. A relationship where one obtains a benefit without doing harm to the other is called commensalism. Where both species are benefitted it is called mutualism.
Both organisms benefit in the mutualism relationship.
The Humming birds , like bees , helps facilitate pollination in plants - this is a mutually , symbiotic , beneficial relationship .
symbiotic