Delhi Police Constable Exam Model Paper 6

In the following question below are given some statements followed by some conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then decide which of the given conclusion logically follows the given statements.
Statements:
All trees are birds.
Some birds are river.
Some rivers are sea.
Conclusions:
I. Some seas are tree.
II. Some rivers are birds.