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WAYS OF LIFE
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19th century Africa agriculture America animals antibiotics areas autotrophs bacteria become biological birds birth-rate breeding Bushmen carbon carbon dioxide carnivores changes chemical climate climax vegetation consumers contain crops cultivation developing countries dioxide disease Earth ecological economic ecosystem effects energy environment erosion Europe example extinct factors family planning farmers farming feed fertile crescent fertility fish food chain forest grasses grassland grazing growing growth habitat harvest herbivores herd human hunter-gatherer hunting important increase India industrial insecticides insects irrigation islands killed lakes land large numbers legumes living million National Parks natural nitrogen nutrients organisms overgrazing parasites pasture percent pest pesticides photosynthesis phytoplankton plankton plants plow poisons pollution population predators problem production protein rainfall reason regions reserves rivers roots secondary succession societies soil species spread succession surface survive tarpan temperature thylacine trees trophic level tropical variety vegetation whales wheat wild wildlife zoos