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1.   Each stage/level of the pyramid is called a "trophic level,"  or the highest position an organism typically occupies in a food chain.  Each trophic level is shared by organisms that occupy the same position in a food chain.

2. As you go up the trophic pyramid, the total number of organisms (or biomass) at the next level decreases because much of the original energy captured from the sun during photosynthesis is lost at each level of the trophic pyramid (see explanation below). Consumers at the highest trophic level are called apex predators. 

3. The trophic pyramid shows that some, but not all, the original food energy made by photosynthesizers is transferred from one trophic level to the next.


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