Two collections of plant material were made on July 13, 2000.
Its diet may have included plant material and small animals.
It'd be better to find out what the plant material is first.
The effects of different plant materials could have been found through trial and error.
Before that time, processes used plant material and were long (up to six months).
Plant materials make up a small portion of its diet.
In the trees, they build their nests out of plant material.
Insects play an important role in recycling dead plant material.
Huge volumes of plant material flow through them like a river, all the day long.
Plant materials were an important cure for diseases throughout history.