Most of the water vapor in earth's atmosphere comes from
sublimation and transpiration
infiltration and surface runoff
rain, sleet, hail, snow, and freezing rain
oceans, seas, lakes, and rivers

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse