Which of the following makes the best analogy to describe the movement of energy in an ecosystem?
a. pool
b. lake
c. river
d. pond

I know the answer is C.River

1. B.Grass, grasshopper, snake,hawk

2. D.Eliminated as heat

3.C.River

4.A. Biomass at the fourth trophic level is approximately ten times smaller than biomass at the third trophic level.

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.