Give scientific reasons : Testis are located in the scrotum outside the abdominal cavity.

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By the process of spermatogenesis of testes, spermatids and spermatozoa are formed. For this whole process the temperature of testis is below $3^{\circ} \mathrm{C}$ than the body temperature. It is necessary for spermatogenesis. The scrotum helps in maintaining the low temperature of testis.

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Match the columns.

Column $I$ Column $II$
$(a)$ Seminiferous tubules   $(1)$ Place for storage and maturity of sperm
$(b)$ Urethra $(2)$ Structure which releases out sperm cells
$(c)$ seminal vesicle $(3)$ A gland exist in pair producing nutrients
$(d)$ Epididymis $(4)$ Coiled duct where sperms start development