Hypothermia occurs due to the loss of excessive heat from the body, resulting in a sudden decrease in body temperature. It is often associated with cold environments or prolonged exposure to cold temperatures. Option 2, human beings, is the correct answer because humans are susceptible to hypothermia. When the body is exposed to cold temperatures for an extended period, it loses heat rapidly, which can lead to a dangerous drop in body temperature. Other options, such as frogs, lizards, and snakes, are not as likely to experience hypothermia because they have different physiological adaptations that help them regulate their body temperature, such as hibernation or seeking warm environments.