A heap of green leaves is lying in one corner of a park. The green leaves in the heap burn with difficulty because:
A. they contain a tough material called cellulose.
B. they contain a lot of water.
C. they contain a green pigment chlorophyll.
D. they do not get sufficient oxygen for burning
Answer:B
A heap of green leaves is lying in one corner of a park. The green leaves in the heap burn with difficulty because:
A. they contain a tough material called cellulose. B. they contain a lot of water. C. they contain a green pigment chlorophyll. D. they do not get sufficient oxygen for burning