DDT was once used as an insecticide to B. kill insects. It was banned in 1972 because it thinned the eggshells of birds of prey like the patriotic bald eagle and the peregrine falcon.
<span>specialized cells, thats what bone and blood cells are considered </span>
Carbon dioxide (chemical formula <span>CO2</span>) is a colorless and odorless gas that is vital to life on Earth. This naturally occurring chemical compound is made up of a carbon atom contently double bonded to two oxygen atoms. Carbon dioxide exists in Earth's atmosphere as a trace gas at a concentration of about 0.04 percent (400 ppm) by volume.Natural sources include volcanoes, hot springs and geysers, and it is freed from carbonate rocks by dissolution in water and acids. Because carbon dioxide is soluble in water, it occurs naturally in groundwater, rivers and lakes, in ice caps and glaciers and also in seawater. It is present in deposits of petroleum and natural gas.<span />
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Levels of carbon keep rising if the carbon cycle is not in control, and because the carbon cycle is not in control, more carbon can get in the atmosphere like carbon dioxide. So if we don't do nothing to reduce our impact on the carbon cycle, the carbon levels in the atmosphere will continue to rise.
