Which describes the life cycle of a plant that has an alternation of generations A. a diploid sporophyte stage and diploid gametophyte stage
B. a diploid sporophyte stage and haploid gametophyte stage
C. a haploid sporophyte stage and diploid gametophyte stage
D. a haploid sporophyte stage and haploid gametophyte stage

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.