<Tr> <Td> Subsurface terrestrial </Td> <Td> 2.5 to 25 </Td> <Td> 3.5 to 215 </Td> </Tr> <P> Estimates for the global biomass of species and higher level groups are not always consistent across the literature . Apart from bacteria, the total global biomass has been estimated at about 560 billion tonnes C. Most of this biomass is found on land, with only 5 to 10 billion tonnes C found in the oceans . On land, there is about 1,000 times more plant biomass (phytomass) than animal biomass (zoomass). About 18% of this plant biomass is eaten by the land animals . However, in the ocean, the animal biomass is nearly 30 times larger than the plant biomass . Most ocean plant biomass is eaten by the ocean animals . </P> <Table> <Tr> <Th> </Th> <Th> name </Th> <Th> number of species </Th> <Th> date of estimate </Th> <Th> individual count </Th> <Th> mean living mass of individual </Th> <Th> percent biomass (dried) </Th> <Th> total number of carbon atoms </Th> <Th> global dry biomass in million tonnes </Th> <Th> global wet (fresh) biomass in million tonnes </Th> </Tr> <Tr> <Th> Terrestrial </Th> <Td> Humans </Td> <Td> </Td> <Td> 2012 </Td> <Td> 7.0 billion </Td> <Td> 50 kg (incl children) </Td> <Td> 30% </Td> <Td> 4.015 x 10 </Td> <Td> 105 </Td> <Td> 350 </Td> </Tr> <Tr> <Td> 2005 </Td> <Td> 4.63 billion </Td> <Td> 62 kg (excl children) </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 287 </Td> </Tr> <Tr> <Td> Cattle </Td> <Td> </Td> <Td> </Td> <Td> 1.3 billion </Td> <Td> 400 kg </Td> <Td> 30% </Td> <Td> </Td> <Td> 156 </Td> <Td> 520 </Td> </Tr> <Tr> <Td> Sheep and goats </Td> <Td> </Td> <Td> 2002 </Td> <Td> 1.75 billion </Td> <Td> 60 kg </Td> <Td> 30% </Td> <Td> </Td> <Td> 31.5 </Td> <Td> 105 </Td> </Tr> <Tr> <Td> Chickens </Td> <Td> </Td> <Td> </Td> <Td> 24 billion </Td> <Td> 2 kg </Td> <Td> 30% </Td> <Td> </Td> <Td> 14.4 </Td> <Td> 48 </Td> </Tr> <Tr> <Td> Ants </Td> <Td> 12,649 </Td> <Td> </Td> <Td> 10 - 10 billion </Td> <Td> 3 x 10 kg (0.003 grams) </Td> <Td> 30% </Td> <Td> </Td> <Td> 10--100 </Td> <Td> 30 - 300 </Td> </Tr> <Tr> <Td> Earthworms </Td> <Td>> 7,000 </Td> <Td> 1881 Darwin </Td> <Td> 1.3 x 10 billion </Td> <Td> 3 g </Td> <Td> 30% </Td> <Td> </Td> <Td> 1,140 - 2,280 </Td> <Td> 3,800 - 7,600 </Td> </Tr> <Tr> <Td> Termites </Td> <Td>> 2,800 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 445 </Td> </Tr> <Tr> <Th> Marine </Th> <Td> Blue whales </Td> <Td> </Td> <Td> Pre-whaling </Td> <Td> 340,000 </Td> <Td> </Td> <Td> 40% </Td> <Td> </Td> <Td> </Td> <Td> 36 </Td> </Tr> <Tr> <Td> </Td> <Td> 4,700 </Td> <Td> </Td> <Td> 40% </Td> <Td> </Td> <Td> </Td> <Td> 0.5 </Td> </Tr> <Tr> <Td> Fish </Td> <Td>> 10,000 </Td> <Td> 2009 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 800 - 2,000 </Td> </Tr> <Tr> <Td> Antarctic krill </Td> <Td> </Td> <Td> 1924--2004 </Td> <Td> 7.8 x 10 </Td> <Td> 0.486 g </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 379 </Td> </Tr> <Tr> <Td> Copepods (a zooplankton) </Td> <Td> 13,000 </Td> <Td> </Td> <Td> </Td> <Td> 10 - 10 kg </Td> <Td> </Td> <Td> 1x10 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Cyanobacteria (a picoplankton) </Td> <Td>? </Td> <Td> 2003 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 1,000 </Td> </Tr> <Tr> <Th> Global </Th> <Td> Prokaryotes (bacteria) </Td> <Td>? </Td> <Td> 2018 </Td> <Td> 1 x 10 cells </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> ≈ 70 </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> </Th> <Th> name </Th> <Th> number of species </Th> <Th> date of estimate </Th> <Th> individual count </Th> <Th> mean living mass of individual </Th> <Th> percent biomass (dried) </Th> <Th> total number of carbon atoms </Th> <Th> global dry biomass in million tonnes </Th> <Th> global wet (fresh) biomass in million tonnes </Th> </Tr>

Why does the first trophic level contains the most biomass