Question

Freshwater biomes have _______.
a.
organisms adjusted to high salinity
b.
more diversity than marine biomes
c.
a salinity of less than 1%
d.
the ability to maintain their temperature year round

Answer 1

c. a salinity of less than 1%

Freshwater biomes have very low salt content (commonly defined as <1% salinity; often <0.5 ppt), unlike marine biomes which are much saltier (~35 ppt, or 3.5%).