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
The world's biodiversity is declining at an alarming rate. Population sizes of vertebrate species measured by the Living Planet Index (LPI) have ... The LPI, which measures trends in thousands of populations of mammals, birds, reptiles, ... Populations of terrestrial species declined by 38 per cent between 1970 and 2012.
ITS B The phloem tissue carries food to the roots.