1
THE SOURCE OF ENERGY FOR PHOTOSYNTHESIS OR THE HEAT FROM THE SUN.
2
ENVIRONMENT IS CONTAMINATED, OR DIRTIED, BY WASTE, CHEMICALS, AND OTHER HARMFUL SUBSTANCES
3
TO USE SOMETHING AGAIN
4
A LARGE, ROUND OBJECT IN SPACE (SUCH AS THE EARTH) THAT TRAVELS AROUND A STAR (SUCH AS THE SUN)
5
THE TREES AND OTHER PLANTS IN A LARGE DENSELY WOODED AREA
