<span>Asbestos is a naturally occurring mineral that has had many commercial uses </span><span>during the last century, so it can be found in many building materials and other </span><span>objects. Excessive exposure through inhalation can result in asbestosis, lung </span><span>cancer, or mesothelioma (another kind of cancer). Asbestos seems to produce </span><span>cancer through the physical interaction of its fibrous structure with living </span>cells. Radon is a naturally occurring radioactive gas with no significant commercial application. Excessive exposure through inhalation can result in lung cancer. Radon produces cancer because it emits ionizing radiation which in turn <span>produces cancer upon sufficient exposure.</span>
Cytokinesis is the final act of cell division in which the cytoplasm is divided into two daughter cells. The cytokinesis process is different between plant and animal cells, since plant cells have walls (in plants, a cell plate is formed between daughter cells)
