Where is light penetration in a river or stream likely to be lowest?

Understand the Problem

The question is asking about the location in a river or stream where light penetration is at its lowest. It provides four options: the source, the mouth, the middle portion, and none of the above, indicating a focus on aquatic ecosystems.

More Information

Light penetration tends to be lowest in the middle portion of a river or stream due to factors like increased sediment and depth.

Tips

Mistaking areas with high turbidity or overhanging vegetation as the key areas can lead to confusion.

Sources

• Brainly - Where is light penetration in a river or stream likely to be lowest? - brainly.com