What structures are connected by the vasa efferentia?

The $Cauda$ $epididymis$ leads to:

Each testicular lobule contains . . . . . . convoluted seminiferous tubules.

Given below are two statements:
Statement-$I$: The scrotum helps in maintaining the low temperature of the testes.
Statement-$II$: Low temperature,compared to the normal internal body temperature,is necessary for spermatogenesis.
In the light of the above statements,choose the most appropriate answer from the options given below.

If the Cowper's gland (bulbourethral gland) is removed,which of the following will be affected?

Testicular degeneration and other disorders of the reproductive system in mammals are due to the deficiency of: