Phytoremediation is (Multiple Choice)

Phytoremediation is
 
  a. rotating crops so that soil minerals are replenished.
  b. replacing eroded topsoil so that plants can grow in the soil again.
  c. plowing under all or parts of crops to improve the soil.
  d. the use of plants to remove pollutants from the environment.
  e. replacing unwanted plants with plants useful to humans.

Question 2

Areas that receive heavy rainfall tend to have ____ soils, and arid regions tend to have ____ soils.
 
  a. acidic; alkaline
  b. pH-neutral; acidic
  c. alkaline; acid
  d. acidic; pH-neutral
  e. pH-neutral; alkaline