If the primary producers produce 5000 energy units, about how much of this energy is available to the third-level consumers?

Answer:
5 energy units
Explanation:
This is called the Ten-Percent rule! Every trophic level you go up, you only take 10% of the previous trophic level's energy!
Primary producers
5000 energy units (100% of 5000)
First-level Consumers
500 energy units (10% of 5000)
Second-level Consumers
50 energy units (1% of 5000)
Third-level Consumers
5 energy units (0.1% of 5000)
The third level consumer can get only 5 enery units from 5000 energy units of producers.
If the primary producers produce 5000 energy units, only 5 energy units are available to the third-level consumers because only 0.1% of energy units are transferred to the third level consumers. By calculation, 0.1% of 5000 energy units are equal to 5 energy units.
So we can conclude that third level consumer can get only 5 enery units from 5000 energy units of producers.
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