Which of the following is a factor that influences where an organism lives in an aquatic ecosystem?

• A. Soil pH
• B. Sunlight availability
• C. Wind speed
• D. Altitude

Answer: (B)

Verified step by step guidance

1. Step 1: Begin by understanding the key factors that influence aquatic ecosystems. Aquatic ecosystems are primarily shaped by abiotic factors such as light, temperature, water chemistry, and physical characteristics of the environment.
2. Step 2: Evaluate each option provided in the question. Soil pH is not directly relevant to aquatic ecosystems because it pertains to terrestrial environments. Wind speed, while it can affect surface water movement, is not a primary factor for determining where organisms live in aquatic ecosystems.
3. Step 3: Consider the role of sunlight availability. Sunlight is a critical factor in aquatic ecosystems because it drives photosynthesis, which supports primary producers like algae and phytoplankton. These organisms form the base of the food web and influence the distribution of other organisms.
4. Step 4: Examine altitude. While altitude can affect temperature and oxygen levels in water bodies, it is not as directly influential as sunlight availability in determining where organisms live in aquatic ecosystems.
5. Step 5: Conclude that sunlight availability is the correct answer because it directly impacts the energy flow and productivity of aquatic ecosystems, influencing the distribution and survival of organisms.