Final answer:
The fourth trophic level will have 10,000 units of energy available if the first level has 10,000,000 units, considering that only about 10 percent of the energy is transferred to the next trophic level.
Step-by-step explanation:
If trophic level 1 in the energy pyramid has 10,000,000 units of energy, the trophic level that would have 10,000 units of energy available is the fourth trophic level. This is because only about 10 percent of the energy at one level is available to the next level due to energy losses in metabolic processes and as heat.
Starting with 10,000,000 units at the first level (producers), the second level (primary consumers) would have 1,000,000 units (10% of 10,000,000), the third level (secondary consumers) would have 100,000 units (10% of 1,000,000), and the fourth level (tertiary consumers) would have 10,000 units (10% of 100,000).