One of the primary scientific objectives of the apollo program was the return of lunar material. why was this so important? what can be learned from samples? are they still of value now?

Solution:

The domain of all step functions is all real numbers :True

As we know that the domin of a function is defined as the set of values of the variable for which the given function is defined.

Irrespective of the kind of function, domain will be always real numbers.

Hence in our case of step function, the domain will be real numbers only.

Hence the domain of the all the steps functions is all real numbers  only.