The answer depends upon the group of organisms: Crowds, herds, flocks, schools, families are all examples of groups of 'like organisms' within the same habitat. Perhaps you are thinking of sympiosis, where two different organisms live together but are mutually benefited by the living arrangement. Some examples of symbiosis would be the anemone and the clown fish, the shark and the remora, or ants and aphids.
A group of similar organisms is called a species.
A group of similar individuals living together in an area is called population.
A group of ecosystems with similar organisms and climates is called a biome. There are several different types of biomes. They are: Tundra, taiga, desert, steppe, rain forest, savanna, and temperate forest.
Population or species
P-o-p-u-l-a-t-i-o-n
a group of similar organisms can produce offspring
If the group is a clone of organisms associated living together which haven't split after their formation, it's called a colony.
bacteria is still around and it was one of the first living organisms
species
Species.
A group of organisms of the same species is called a population. A group of different species living together is called a community.
my teacher said it is "species" not genus.