An interaction where one organism kills another.

• A. Predation
• B. Competition
• C. Symbiosis
• D. Commensalism

Answer: (A)

Predation is the interaction in which a predator kills another organism (the prey) to eat it. This killing is the defining feature of predation and it directly links to how predators catch, kill, and consume their food, shaping both predator adaptations (speed, camouflage, hunting tactics) and prey defenses (alertness, herd behavior, armor or warning signals).

This differs from competition, where species struggle for the same resources without one killing the other as a necessary outcome. It also differs from symbiosis, which describes long-term associations between species; within that umbrella are subtypes like mutualism, parasitism, and commensalism, none of which necessarily involve the predator killing the other for food in the immediate interaction.