Answer:
In the case of the polynomial a^3, it represents a monomial with a single term, which is a cubed power of the variable a. This polynomial does not have a constant term because no term does not involve the variable.
A constant term is a term that does not have any variables, such as 3 or -5. In the polynomial a^3, there are no such terms because all the terms involve the variable a raised to some power (in this case, the power is 3).
Hopefully this helps :)