What does the term "symbiosis" describe?

The term "symbiosis" refers to the interaction between two different organisms that live in close proximity to each other. This relationship can take various forms, including mutualism, commensalism, and parasitism. In mutualism, both species benefit; in commensalism, one species benefits while the other is neither helped nor harmed; and in parasitism, one organism benefits at the expense of the other. This close interaction can significantly influence the behavior, survival, and evolution of the organisms involved, reflecting the complexity of ecological relationships.

The other choices do not accurately capture the essence of symbiosis. Competition refers to the struggle between organisms for the same resources, which is not an interaction that involves close living together. The concept of evolution of species adaptation pertains to changes that occur in species over time, often as a result of environmental pressures, but doesn't specifically address direct interactions between organisms. Lastly, migration of organisms deals with how species move and settle in new habitats rather than the relationships they form with other organisms in close proximity.