What is a major drawback of using fossil fuels?
a. they warm the planet
b. they are flammable
c. they release oxygen when burned
d. they contain no greenhouse gases

The major drawback of using fossils is that they warm the planet

A- a reduction in biodiversity

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.