An astronomer studying planets outside our solar system has analyzed the atmospheres of four planets. which of these planets’ atmospheres would be most able to support a colony of humans?

What planets are you talking about? Well, the one with a good level of oxygen ( allows humans to breath and forms the ozone layer that protects us from the Suns harmful rays) and hydrogen( mixes with oxygen to make water). The suns impact on the planet affects the whole life on it, so you need to take that into consideration. List me the four planets and I can give you a much better explanation.

What you should re write your question it doesn’t make sense

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases.