__ is a thick skinned sack that surrounds the testes and protects it.
The Scrotum is a thick skinned sack that surrounds the testes and protects it
Assertion(A): Colouration of skin is due to a pigment melanin.
Reason(R): It protects the skin and inner parts from ultraviolet sunrays.
Keratin is the skin pigment that protects it against ultraviolet light.