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Observations on the State of the Planet
The Human Respiratory System
18 other sections not shown
acres activity addicts Agriculture air pollution American amount amphetamines antifertility areas atoms bacteria barbiturates become beetle biological birds birthrate carbon cause cells changes chemical compounds contraceptive corn Courtesy Michigan Department Courtesy U.S. Department crops cycle damage death rate dioxide disease drug ecosystem effect eggs energy environment environmental erosion estrogen extinct factors fallopian tube farm feet female fertility fish forests habitat hormones human increase individuals insects intrauterine device IUDs killed Lake land living lower male marijuana mercury method miles million National natural occur ocean organisms ovulation ovum oxygen particles percent period pesticides pests plowing population density pounds predators pregnancy present problems produce progestin rabbits radiation radioactive reduced reproductive River screwworm sewage soil species sperm spermicides sulfur sulfur dioxide survival survivorship curve temperature tion tissue treatment trees United users uterus waste whales wheat whooping crane Wildlife women