Which of the following statements about wetlands is not true?

a. There is more than one type of wetland.

b. Wetlands can contain either freshwater or saltwater.

c. Wetlands exist in a small range of climates.

d. Wetlands support a variety of organisms.

The correct option is C. Wetlands do not exist in a small range of climates, it exist in a large range of climate. Wetlands are found both in warm and cold climates. Different types of wetlands are found in different climates. For instance, mashes are found in warm climates while bogs are typically found in cold climates.