Some plants have developed a thick waxy coating that helps prevent the loss of water. In order for plants to develop this thick waxy coating over many generations, what must be true?

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

i think the answer is gold im not entirely sure