The true statement about the relationships between the number sets is:
Whole numbers include all natural numbers and 0.
The other statements are false for the following reasons:
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Some irrational numbers are also integers: This is false because irrational numbers cannot be integers; integers are whole numbers that can be positive, negative, or zero.
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Not all natural numbers are real numbers: This is false because all natural numbers are indeed real numbers.
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All rational numbers are also integers: This is false because rational numbers include fractions and decimals, whereas integers are whole numbers (positive, negative, or zero).