Question

Limnetic, profundal, littoral, and benthic have what in common?
a.
They refer to the upper-level zones found in salt- and freshwater ecosystems.
b.
They are all zones found in freshwater systems.
c.
They refer to the lower-level zones found in salt- and freshwater ecosystems.
d.
They are all zones found in saltwater systems.

Answer 1

b. They are all zones found in freshwater systems.

(These terms—littoral, limnetic, profundal, and benthic—are commonly used to describe zones in lakes and other freshwater bodies.)