Ponds, lakes, streams, rivers, and wetlands are all a part of what aquatic region?

desert region

marine region

grassland region

freshwater region

Freshwater Region

Explanation:

If the ocean was an option, then maybe it would be Marine Region but it not because pond, lakes , streams and rivers don't have salt in it.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.