Two statements are given, followed by three conclusions numbered I. II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.

Statements:
Some plants are trees.
All trees are bushes.
Conclusions:
I. Some bushes are plants.
II. All bushes are plants.
III. No bush is a plant.