<Tr> <Th> Geographic location </Th> <Th> Number of cells (× 10) </Th> <Th> Billions of tonnes of carbon </Th> </Tr> <Tr> <Td> Ocean floor </Td> <Td> 2.9 to 50 </Td> <Td> 4.1 to 303 </Td> </Tr> <Tr> <Td> Open ocean </Td> <Td> </Td> <Td> 1.7 to 10 </Td> </Tr> <Tr> <Td> Terrestrial soil </Td> <Td> 2.6 </Td> <Td> 3.7 to 22 </Td> </Tr>

What trophic level contains the greatest biomass in most ecosystems explain why this occurs