Which would not be classified as a pure substance

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.

If you decide to make the leap to horse ownership it truly is a life changing event. once you sign the dotted line on the bill of sale you will have full responsibility for care, custody, training and financing your new horse.  . and leasing is just for a period of time for a amount of )