In what ways can frostbite occur?

Frostbite occurs when skin and other tissues freeze due to extreme cold exposure. One of the common causes of frostbite is improper handling of dry ice, which is solidified carbon dioxide at temperatures around -78.5 degrees Celsius. When skin comes into direct contact with dry ice, it can freeze tissues almost instantaneously, leading to frostbite. The extremely low temperatures can damage skin cells and blood vessels, resulting in serious injuries that can necessitate medical attention.

In contrast, while increased altitude exposure, sleeveless clothing, and using makeup may have some implications for overall warmth or comfort, they do not directly lead to the freezing of tissues as dry ice does. Increased altitude can lead to other health issues, sleeveless clothing may expose skin to colder air but does not specifically cause frostbite on its own, and makeup does not have any effect on tissue temperatures. Therefore, the connection between dry ice exposure and frostbite is direct and significant, making it the correct choice for how frostbite can occur.