What is the difference between a shrub and a tree?
Some biologists maintain that there is no genetic difference between shrubs and trees - some species may have expressions in tree form and shrub form.  Other scientists believe that the physical form is essential and that shrubs are distinct from trees.
<START_INST>What is the difference between a shrub and a tree?<END_INST><START_CTX><END_CTX><START_A>Some biologists maintain that there is no genetic difference between shrubs and trees - some species may have expressions in tree form and shrub form.  Other scientists believe that the physical form is essential and that shrubs are distinct from trees.<END_A>