Answer:
 x³y³ is monomial.
Explanation:
Given :Polynomial x³y³ .
To find : Identify monomial binomial trinomial.
Solution : We have given that 
Polynomial x³y³ .
Monomial : A polynomial with just one term.
Examples : 1) 3xy 
2) 5y²x³ Both are monmial .
 x³y³ is also a monomial because it has only one term.
Therefore, x³y³ is monomial.