The true statement about the relationships between the number sets is:
Whole numbers include all natural numbers and 0.
To clarify the other statements:
- Some irrational numbers are also integers: This is false; irrational numbers cannot be integers as integers are whole numbers without fractional or decimal parts.
- Not all natural numbers are real numbers: This is false; in fact, all natural numbers are a subset of real numbers.
- All rational numbers are also integers: This is false; rational numbers can be fractions (like 1/2) that are not integers.
Thus, the first statement is the only true one.