What is the purpose of layers of dead cells around stems, such as bark on trees?

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a