Those are called parasites. Such as tape worms, ticks, leeches, flees, and other bodily pests.
Symbiotic relationship.
To define it furthur would be a mutualistic relationship
Symbiosis is when two, or more, creatures live together for their mutual benefit.
It is known as a symbiotic relationship.
It is called Mutualism. The symbiotic relationship in which both species benefit, is called mutualism.
Aquatic plants and animals live together in the pond because they both bond in the their same environment to either help each other with benefit or even provide a home.
an interaction between two species that benefits both is a mutual ism relationship.
Two organisms of different species that live together with one clearly benefitting from such living arrangements and the other suffering from the partnership is called parasitism. This is a symbiotic relationship.
Synergistic
The main benefit is that there is safety in numbers.
you will always have that person to cuddle with at night.
Lesbians are no different that straight people who decide to live together. If the chemistry isn't there should be no problem with the relationship.
Yes. Among the simplest of the life forms are the protozoa, proto- (first) and -zoa (animals). They consist of a single cell. There are free-living forms, such as amoebas and Paramecia, while others live in other animals and may be parasitic such as Giardia, which is an intestinal parasite of humans and animals (the protozoan deriving benefit at the expense of the host), while others have a symbiotic relationship with the host (the protozoan and host both deriving benefit from the relationship).
That's a 'symbiosis'. You didn't mention it in your 'definition', but a symbiosis is typically to the mutual benefit of the organisms.