Man and Environment

interspecific interactions

intraspecific interactions

parasitism

symbiosis

snails

sparrows

clover leaves

hawk

phytoplankton

protozoan

plants

animals

host cannot survive without parasite

parasite cannot survive without host

parasite causes harm to host

disease causing viruses are permanent parasites

pyramid of numbers

pyramid of primary consumers

pyramid of biomass

pyramid of decomposers

beginning of food chain

end of food chain

center of chain

top of chain

water pollution

land pollution

soil pollution

air pollution

natural ecosystems

biosphere

artificial ecosystems

community

leech

roundworm

tapeworm

Ascaris

nitrogenous virus

nitrogenous bacteria

ammonifying virus

ammonifying bacteria