What are suspended solids primarily responsible for in water?

Suspended solids are primarily responsible for causing turbidity and cloudiness in water because they consist of tiny particles that remain floating in the water column. When these particles are present in significant amounts, they scatter and absorb light, reducing water clarity. This turbidity can have several implications for aquatic ecosystems as it affects the penetration of sunlight, which is essential for the photosynthesis of aquatic plants. It can also interfere with the growth and behavior of aquatic organisms, as well as complicate water treatment processes. Therefore, the presence of suspended solids directly correlates with increased turbidity, making this the correct response.