The Great Lakes are troubled with invasive species

The Great Lakes are troubled with invasive species. Which of the following aquatic organisms is considered invasive?
A.  zebra mussels
B.  trout
C.  darters
D.  All of the choices are considered invasive.
E.  None of the choices are considered invasive.


Aquatic organisms located off the ocean floor are
A. benthic.
B. pelagic.
C. neritic.
D. littoral.
E. None of the choices are correct.


The timing and extent of tides are a function of all of the following except
A. the moon's gravitational force.
B. the sun's gravitational force.
C. geography
D. the size of the body of water
E. salinity levels