Yesterday garner was reading about the human nervous system. he knew it was a communication network that conveys messages throughout the body, but he did not realize it was made up of as many as 100 billion

The answer is neurons.

The nervous system is a network that made by neurons. Neurons have a feet-like organelle called axons that connect them with each other. These allow the brain to be connected with a muscle or any organ that located far away. The connection need many cells which makes them have a high cell count.

True statement gravity force is more on bigger mass, less on smaller mass.all mass fall on planet with same acceleration and speeds

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.