The universe began about 14 billion years ago and has been expanding and cooling ever since. What does this statement most completely describe? the Doppler effect
the big bang theory
cosmic background radiation
light years

Because some people pollute water ans waste it

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.