An interaction between two individuals where both are negatively impacted is calledMultiple choice question.competition.predation.commensalism.parasitism.

Break Down the Problem

1. Identify the key terms in the question: interaction, two individuals, negatively impacted.
2. Assess the definitions of each multiple-choice answer: competition, predation, commensalism, parasitism.

Relevant Concepts

1. Competition: A relationship where individuals or species compete for the same resource (food, space, etc.), leading to a negative impact on both.
2. Predation: A relationship where one individual (the predator) benefits by feeding on another (the prey), resulting in a negative impact primarily on the prey.
3. Commensalism: An interaction that benefits one organism while the other is neither helped nor harmed.
4. Parasitism: A relationship where one organism (the parasite) benefits at the expense of the other (the host), leading to a negative impact on the host.

Analysis and Detail

• Competition fits the criteria because both parties are adversely affected by the competition for resources.
• Predation typically has one benign entity (predator) and one negatively impacted (prey).
• Commensalism does not fit as it implies no harm to one party.
• Parasitism results in harm to the host, but benefits the parasite only.

Verify and Summarize

The only scenario that describes an interaction where both individuals involved are negatively impacted is competition.

Final Answer

The correct answer is competition.