Math 6

Question Analysis
This question tests the student's understanding of the closure property of natural numbers under different operations.

Key Concept Explanation
The closure property of natural numbers states that the sum of two natural numbers is always a natural number. This is not true for division, subtraction, or square root.

Step-by-step Solution
1. Identify the operation that always results in a natural number: Addition is the only operation that always results in a natural number when applied to any two natural numbers.
2. Verify the other operations: Division, subtraction do not always result in a natural number. For example, (not a natural number),

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