Which of the following is an example of a biotic factor in a marine ecosystem?

• A. Salinity
• B. Sunlight
• C. Temperature
• D. Seaweed

Answer: (D)

Verified step by step guidance

1. Understand the difference between biotic and abiotic factors: Biotic factors are living components of an ecosystem, such as plants, animals, and microorganisms. Abiotic factors are non-living physical and chemical elements, like sunlight, temperature, and salinity.
2. Identify the options given in the problem: Salinity, Sunlight, Temperature, and Seaweed.
3. Classify each option: Salinity, Sunlight, and Temperature are abiotic factors because they are non-living elements that affect the ecosystem.
4. Recognize that Seaweed is a living organism, making it a biotic factor. Seaweed is a type of marine algae that plays a crucial role in marine ecosystems by providing food and habitat for various marine species.
5. Conclude that among the given options, Seaweed is the correct example of a biotic factor in a marine ecosystem.