The sulfur dioxide in the atmosphere:
A) is a major contributor to acid rain.
B) can be an important source of sulfur nutrition for plants.
C) comes from fires such as fossil fuel burning, volcanoes and forest fires.
D) all of the above
E) none of the above
Question 2
Most irrigation systems are very inefficient with less than half the water that is taken from streams ever reaching the plants.
Indicate whether the statement is true or false