Question

this stream order is where most rooted plants can be found:
1st-2nd order streams
3rd-5th order streams
none of these
higher order streams

Explanation:

Stream order correlates with stream characteristics: 1st-2nd order streams are small, fast-flowing, with shallow, turbulent water that does not support most rooted plants. Higher order streams are large, deep, and have too much water movement or depth for widespread rooted plants. 3rd-5th order streams are medium-sized, with slower, deeper, calmer sections that provide the stable, shallow-to-moderate depth environment most suitable for rooted aquatic plants to establish and grow.

Answer:

3rd-5th order streams