Multiple choice

In the human excretory system, which of the following are in pairs?

a. Urinary bladder b. Kidney c. Urethra d. Ureters

  1. Only a and b

  2. Only a and c

  3. Only a and d

  4. Only b and d

  5. Only b and c

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option. Kidneys and ureters are both two in numbers.