How does the amount of biomass at the fourth trophic level compare to the amount of biomass at the third trophic level immediately below it

The BIOMASS at the fourth level will be greatly reduced when compared to that at the third. As you move through the trophic levels the BIOMASS that remains available always reduces since the consumption and conversion into an available energy source can never be one hundred percent efficient.

11. gene12. allele13. crossing over14. linked15. gene16. x17. males, femalesapologies if numbers are out of order.