Question

how is life difficult in hot and cold desert

Answer 1

At night, without the clouds to contain the heat, the desert temperature can fall to as low as 40°F. Extreme temperatures combined with little rainfall make desert life difficult for people, plants, and animals. Yet, some life forms have adapted to even the most severe desert environment.

Answer 2

cold deserts have too much low temperature and are very very cold so there is very less amount of water available there and also availability of food is very less
now in hot deserts also the temperature is very high so enough water is not available for consumption and also food shortage exists in most part of year that's why living in hot and cold deserts is not easy