Final answer:
The combining form for the sac that holds the testicles outside of the body is 'scrotum'.
Step-by-step explanation:
The combining form for the sac that holds the testicles outside of the body is scrotum.
The combining form for the sac that holds the testicles outside of the body is "scroto-." The term "scrotum" refers to the pouch of skin and muscle that houses the testes and helps regulate their temperature for proper sperm development. When you see the combining form "scroto-" used in medical terminology, it often relates to structures or conditions associated with the scrotum.