Since there are no choices to choose from, I'll just site all the structures of the leaf with its role then.
A Leaf has the following structures:
Cuticle
Upper epidermis layer
Palisade layer
Xylem
Phloem
Spongy mesophyll layer
Air space
Lower epidermis layer
Stomata
<span>Guard cells</span>
water that travels across land may pick up substance and become contaminates.
Explanation:
The answer is F...because h2o molecules are heavier than the atmosphere it surrounds. Therefore, gravity takes over. plse correct me if wrong.
because of gravity, h2o is directed down. That's how plants survive, Remember, ..what goes up, must go down...per " isaac newton."