Human beings have organ system level of organisation. How many of the following are present in an excretory system in a human?
(a) A pair of ureters
(b) A pair of urinary bladders
(c) A pair of urethras
(d) A pair of kidneys
A
Two
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B
Four
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C
One
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D
Three
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Solution
The correct option is A Two Answer (2)
A human's excretory system consists of a pair of kidneys, one pair of ureters, single urinary bladder and single urethra.