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The venous system of frog differs from the of a mammals in the presence of ______?

The venous system of frog differs from the of a mammals in the presence of ______?

مینڈک کا زہریلا نظام ______ کی موجودگی میں ستنداریوں سے مختلف ہے؟
Explanation
  • Frogs have a renal portal system.
  • It carries blood from the hind limbs to the kidneys before reaching the heart.
  • Mammals lack this system, as their venous return follows a direct route to the heart.