Apparent color includes which substances?

Apparent color in water is influenced by the presence of both dissolved organic and suspended substances. This is because apparent color is the color perceived by the observer, which can be affected by a variety of particles and compounds within the water.

Dissolved organic substances, such as humic acids derived from decaying plant material, contribute to the yellow-brown color often seen in natural waters. Additionally, suspended substances, which may include silt or clay particles, can scatter light, further impacting how the water appears to an observer.

By considering both types of substances, it becomes clear that they collectively contribute to the overall color we perceive, thus supporting the choice that includes both dissolved organic and suspended substances as the correct answer.