The water in a reservoir with a sandy bottom is cleaner, not cloudy and there are solid particles to which it is convenient to attach. And in a reservoir with a muddy bottom, illumination is worse due to the smallest silt particles that hang in the water column. Due to the size of the silt – very small particles – it is more difficult to attach to such a bottom, therefore, in such reservoirs, algae are represented mainly by plankton.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.