Plants, animals, fungi, slime moulds, protozoa, and algae are all eukaryotic. 1  These cells are about fifteen times wider than a typical prokaryote and can be as much as a thousand times greater in volume.
A drought is a period of below-average precipitation in a given region, resulting in prolonged shortages in its waters supply, whether atmospheric, surface or ground water.
Because drought is defined as a deficit in water supply, it can be caused by a number of factors. The most important one though relates to the amount of water vapor in the atmosphere as this is what creates precipitation. More rain, sleet, hail, and snow can occur where there are moist, low pressure air systems. 1  If there is an above average presence of dry, high pressure air systems instead, less moisture is available to produce precipitation (because these systems cannot hold as much water vapor).