Final answer:
The backward roll can be used in both fresh water and salt water.
Step-by-step explanation:
The statement that the backward roll cannot be used in salt water is false.
The backward roll is a entry method used in water activities such as diving and swimming, where the person rolls backward into the water. It is commonly used in both fresh water and salt water.
For example, divers often use the backward roll entry when diving into both fresh water and salt water, as it allows for a smooth entry and minimizes the risk of injury.