In ecology, commensalism is a class of relationship between two organisms where one organism benefits without affecting the other. It compares with mutualism, in which both organisms benefit, amensalism, where one is harmed while the other is unaffected, and parasitism, where one benefits while the other is harmed.n ecology, commensalism is a class of relationship between two organisms where one organism benefits without affecting the other. It compares with mutualism, in which both organisms benefit, amensalism, where one is harmed while the other is unaffected, and parasitism, where one benefits while the other is harmed.
Drug interactions also may occur when two drugs that have similar (additive) effects or opposite (canceling) effects on the body are administered together. For example, there may be major sedation when two drugs that have sedation as side effects are given, for example, narcotics and antihistamines.
The ability of two or more waves to overlap and form a new wave is known as interference. It occurs when two waves meet while traveling through the same medium.... The ability of two or more waves to overlap and form a new wave is known as interference. It occurs when two waves meet while traveling through the same medium. Wave interference causes a new wave to form with a new shape. Constructive interference occurs when the two interfering waves have the same displacement in the same direction. Constructive interference forms a new wave with a larger displacement than the two original interfering waves.