Chapter 54 Reading Quiz. Which trophic level ultimately supports all of the others? What 2 things limit primary productivity in aquatic ecosystems? Which biogeochemical cycle includes evaporation & precipitation? Which biogeochemical cycle includes photosynthesis & cellular respiration?.
- the organic mass available to consumers
1. Productivity in the trophic levels
3. Numbers of individuals
- CO2 doesn’t escape the earth
- O3 is broken apart and does not provide the protection from UV rays