When do the Leydig cells mature in males?

In most of the mammals,the testes are situated outside the abdominal cavity because

$A$: The secretions of male accessory glands constitute the seminal plasma,which is rich in fructose,calcium,and certain enzymes. $R$: Fructose serves as a source of energy for the sperms.

Males have a number of internal accessory organs. Which one$(s)$ is/are responsible for secreting fluid containing fructose and prostaglandins?

The path of sperm transport is given below. Provide the missing steps in blank boxes.
$\boxed{\text{Seminiferous tubules}} \to \boxed{\text{Rete testis}} \to \boxed{A} \to \boxed{\text{Epididymis}} \to \boxed{B} \to \boxed{\text{Urethra}}$

The seminiferous tubules of the testis are lined by the germinal epithelium consisting of which of the following?