Man and Environment

assimilation

denitrification

ammonification

nitrification

mutualism

symbiosis

commensalism

predation

natural ecosystems

artificial ecosystems

biosphere

community

methane

oxygen

sulphur dioxide

nitrogen dioxide

same species

two species

different species

equal species

cattle, wolves and owls

predatory birds, fox and snakes

grasshopper, rabbit and deer

fungi, protozoan and animals

ecosystem

population

natural biosphere

artificial biosphere

secondary producers

tertiary consumers

primary consumers

secondary consumers

carbon fixation

nitrogen fixation

oxygen fixation

nitrate fixation

nitrogen dioxide

ammonium dioxide

sulphur dioxide

carbon dioxide