A key characteristic of aquatic dead zones is ________
A) a low concentration of keystone species
B) a low concentration of oxygen
C) low concentrations of nitrogen and phosphorus
D) a lack of water
E) a high concentration of urban development
Answer: B
You might also like to view...
A mechanic can lift cartons a vertical distance of 1 m, or roll them up a 2-m-long ramp to the same elevation. With the ramp, the applied force needed is
A. half as much. B. twice as much. C. the same. D. none of the above
Hudson stands at rest on a pair of bathroom scales. The scale readings will always
A. add up to more than his weight. B. add to equal his weight. C. each be half his weight. D. each equal his weight.
The depletion of the ozone layer near the poles had a major impact on the productivity of plankton. Indicate whether the statement is true or false
Of the following: various sulfur gases, hydrochloric acid, and carbon monoxide, only carbon monoxide is poisonous.
Answer the following statement true (T) or false (F)