Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow from the statements.

Statements:

All streams are rivers.

All ponds are rivers.

All rivers are oceans.

Conclusions:

I. Some oceans are streams.

II. All ponds are oceans.

III. Some oceans are not rivers.