Which of the following describes the relationship between two organisms in which one benefits and neither is harmed?
Omnivory refers to act of feeding on plants and animals; plants and animals are negatively affected. Mutualism is an association of organisms wherein both are benefitted. Parasitism is the relationship where one organism is benefitted at the expense of other. Predation refers to the act of feeding on other animals; predator is benefitted at expense of prey. Commensalism refers to the relationship wherein one organism is benefitted while other remains unaffected. Thus, the correct answer is A.