You get lost in extremely cold weather. you are unable to start a fire. which of the following is the best way to survive? wrap up in a thermal foil blanket. cover yourself in snow for insulation. change from wool to cotton clothing if available. exercise vigorously to stay warm.

Wrap up in a thermal foil blanket

Explanation:

Thermal foil blanket reflects the heat of the body back to the body. In this way they keep hot the body of the wearer. You cannot cover yourself with snow because you will freeze and ultimately die. Wool clothes are warmer than cotton so, it is not good choice to change cloths from wool to cotton. If you will do exercise vigorously, you will be tired soon. Hence, warp up in a thermal foil blanket is the correct answer.