Indicate whether the following statements are True (T) or False (F).
1. The difference of two natural numbers is always a natural number.
2. The quotient of two natural numbers is always a rational number
3. The sum of two natural numbers is always a natural number.
4. The ratio of two natural numbers is always positive
5. The difference of two natural numbers is always an integer.
6. The quotient of two natural numbers is always a natural number.
7. The product of two natural numbers is always a natural number.

In order to get credit for this problem all answers must be correct.