In ecology, predation is a biological interaction where a predator (an organism that is hunting) feeds on , but the act of predation often results in the death of its prey and the eventual absorption of the prey's tissue through consumption Competition is a form of interaction between living things. It is the basic needs occur between animals and plants. When the basic needs become limited, living things that live in the same habitat compete with each other for resources. Competition causes weaker living things to be eliminated from a habitat, only the stronger will survive.

Mutualism is the way two organisms of different species exist in a relationship in which each individual benefits from the activity of the other. Similar interactions within a species are known as co-operation. Mutualism can be contrasted with interspecific competition, in which each species experiences reduced fitness, and exploitation, or parasitism, in which one species benefits at the expense of the other.

In biology/ecology, parasitism is a non-mutual symbiotic relationship between species, where one species, the parasite, benefits at the expense of the other, the host. Traditionally parasite referred primarily to organisms visible to the naked eye, or macroparasites (such as helminths). Parasite now includes microparasites, which are typically smaller, such as protozoa,[1][2] viruses, and bacteria.[

In ecology, commensalism is a class of relationships between two organisms where one organism benefits from the other without affecting it. This is in contrast with mutualism, in which both organisms benefit from each other, amensalism, where one is harmed while the other is unaffected, and parasitism, where one benefits while the other is harmed.