Man and Environment

rhizobium

euglena

amoeba

paramecium

pyramids of individual

pyramids of population

pyramids of community

pyramids of numbers

herbivores only

carnivores only

aquatic carnivores

herbivores and carnivores

1928

1970

1983

1927

endoparasite

ectoparasite

digestion parasites

synthetic parasites

greenhouse effect only

global warming only

acidic rain

green house effect and global warming

biological oxygen fixation

atmospheric oxygen fixation

atmospheric nitrogen fixation

biological nitrogen fixation

parasitism

mutualism

demonism

commensalism

nitrates

nitrites

nitric acid

nitric oxide

temporary parasites

ectoparasite

endoparasite

permanent parasites