A symbiotic relationship in which one species benefits and the other is harmed is known as:

• A. Commensalism
• B. Competition
• C. Mutualism
• D. Parasitism

Answer: (D)

Verified step by step guidance

1. Understand the concept of symbiotic relationships: Symbiosis refers to a close and long-term biological interaction between two different biological organisms. There are different types of symbiotic relationships, including mutualism, commensalism, parasitism, and competition.
2. Define parasitism: Parasitism is a type of symbiotic relationship where one organism (the parasite) benefits at the expense of the other organism (the host), which is harmed in the process.
3. Compare parasitism with other types of symbiotic relationships: In mutualism, both species benefit. In commensalism, one species benefits while the other is neither harmed nor helped. In competition, both species are negatively affected as they compete for the same resources.
4. Identify the relationship described in the problem: The problem specifies that one species benefits while the other is harmed, which matches the definition of parasitism.
5. Conclude that the correct answer is parasitism based on the definitions and comparison of symbiotic relationships.