How many tropic levels are in the flowing food chain?

Four tropic levels.

Explanation:

Generally, there is a maximum of four trophic levels. Many consumers feed at more than one trophic level. Umm...for example, humans are primary consumers when they eat plants such as vegetables.

dz nuts.   eeneneneeenenne

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.