<P> Terrestrial biomass generally decreases markedly at each higher trophic level (plants, herbivores, carnivores). Examples of terrestrial producers are grasses, trees and shrubs . These have a much higher biomass than the animals that consume them, such as deer, zebras and insects . The level with the least biomass are the highest predators in the food chain, such as foxes and eagles . </P> <P> In a temperate grassland, grasses and other plants are the primary producers at the bottom of the pyramid . Then come the primary consumers, such as grasshoppers, voles and bison, followed by the secondary consumers, shrews, hawks and small cats . Finally the tertiary consumers, large cats and wolves . The biomass pyramid decreases markedly at each higher level . </P> <Table> <Tr> <Th> The marine food chain </Th> </Tr> <Tr> <Td> predatory fish </Td> </Tr> <Tr> <Td> ↑ </Td> </Tr> <Tr> <Td> filter feeders </Td> </Tr> <Tr> <Td> ↑ </Td> </Tr> <Tr> <Td> predatory zooplankton </Td> </Tr> <Tr> <Td> ↑ </Td> </Tr> <Tr> <Td> zooplankton </Td> </Tr> <Tr> <Td> ↑ </Td> </Tr> <Tr> <Td> phytoplankton </Td> </Tr> </Table> <Tr> <Th> The marine food chain </Th> </Tr>

Which group would have the greatest biomass in a desert ecosystem