Answer: The degree of the first term.
Step-by-step explanation:
The function:

The left and right ends would be indicated when x is changed to -x. When this is substituted, the change is indicated by the first term because only the degree of first term is odd.
Let the left hand side be donated by -x.
Then,

Hence, the correct option is the degree of the first term indicates the left and right end points of the function.