Which of these is a biotic factor in an ecosystem? A. Strands of seaweed B. Crystals of salt C. Grains of sand D. Rays of sunlight

Break Down the Problem

1. Identify the definitions of biotic factors and abiotic factors in an ecosystem.
2. Analyze each option provided to determine which one qualifies as a biotic factor.

Relevant Concepts

• Biotic factors are the living components of an ecosystem, including plants, animals, bacteria, and fungi.
• Abiotic factors refer to the non-living components, such as minerals, sunlight, temperature, and water.

Analysis and Detail

1. A. Strands of seaweed: This is a living plant and thus a biotic factor.
2. B. Crystals of salt: Salt is a mineral and considered an abiotic factor.
3. C. Grains of sand: Sand consists of small particles of rock and is classified as an abiotic factor.
4. D. Rays of sunlight: Sunlight is an abiotic factor affecting temperature and photosynthesis.

Verify and Summarize

Among the options, only option A, "Strands of seaweed," qualifies as a biotic factor in the ecosystem, while the other options are abiotic factors.

Final Answer

A. Strands of seaweed