1 Most cases of COPD, and therefore emphysema, are caused by cigarette smoking. 2  Emphysema is rarely caused by a congenital condition known as Î±1-antitrypsin deficiency, for which there is a lab test. 3  Shortness of breath and cough are the main symptoms of emphysema.
Most plants, most algae, and cyanobacteria perform photosynthesis; such organisms are called photoautotrophs. Photosynthesis is largely responsible for producing and maintaining the oxygen content of the Earth's atmosphere, and supplies all of the organic compounds and most of the energy necessary for life on Earth.
Organisms that do not make their own food in other words, organisms that are not able to carry out photosynthesis on their own are called heterotrophs. Plants are called autot â¦ rophs. Mammals is a good example of heterotrophs. Only plants and certain fungi are capable of carrying out the process of photosynthesis.