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.
Plants require photosynthesis to make their own food (glucose) from water, carbon dioxide, and sunlight. They use a process called cellular respiration to break the glucose do â¦ wn into energy that the plant can use.Animals require the food and oxygen produced by photosynthesis for cellular respiration themselves.Plants, on the other hand, need animals' carbon dioxide in order to photosynthesize. Therefore, all life on Earth depends on photosynthesis. 1 person found this useful.. Photosynthesis is used to produce food from light, this is the most basic foundation of almost all food and life cycles on earth (primary producers). 2. Photosynthesis help â¦ s moderate the carbon dioxide levels of the planet.