There is no THE two-digit natural number because there are many of them. 10, 11, 12, .. 99 are all 2-digit natural numbers.
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there is a zero in a natural number.
No natural number is irrational.
Zero is a natural number.
0 is whole no but not a natural no.
Yes a real number is a natural since real is natural so anything real is natural and so a real number is natural.