Organisms in the population interact with each other for the benefit of them. This is known as population interaction. They can interact with each other by mutualism, commensalism, competition, parasitism and predation.
Organism is highly influenced by the environment. There are two factors which characterize the habitat of an organism; abiotic and biotic components.
Population is a group of individual living in a well defined geographical area, share or compete for similar resources or potentially interbreed. size of population changes according to some factors. Adaptation is any attribute of an organism that enable the organisms to survive and reproduce in its habitat.