Which of the following constitutes the human excretory system?
1
One pair of kidneys, one pair of ureters, single urinary bladder and single urethra
2
One pair of kidneys, single ureter, single urinary bladder and single urethra
3
One pair of kidneys, single urinary bladder, single ureter and one pair of urethra
4
Single kidney, single ureter, one pair of urinary bladder and single urethra