In humans,the primary excretory system consists of:
$I.$ Pair of kidneys
$II.$ One pair of ureters
$III.$ Urinary bladder
$IV.$ Urethra
$V.$ Skin
$VI.$ Lungs
$VII.$ Liver

  • A
    $I, II, III$ and $IV$
  • B
    $III, IV, V$ and $VI$
  • C
    $II, III, IV$ and $V$
  • D
    $I, II, III, IV, V, VI$ and $VII$

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Assertion $A$: Nephrons are of two types: Cortical and Juxta-medullary,based on their relative position in the cortex and medulla.
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