What is correct about sinus venosus

Options :
  1. it is situated on dorsal surface of rabbit heart
  2. it is situated ventrally in frog heart
  3. it sends blood to dorsal aorta
  4. it opens into right auricle
Answer and Explanation :-

Answer: Option 2


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No doubt Pain as God's megaphone is a terrible instrument it may lead to final and unrepented rebellion. But it gives the only opportunity the bad man can have for amendment. It removes the veil it plants the flag of truth within the fortress of a rebel soul.
-C.S. Lewis The Problem of Pain