A biologist examines a single-celled organism isolated from a hot spring. The organism is a photosynthetic halophile that uses the pigment
bacteriorhodopsin. In which kingdom should the biologist classify the organism?
A Archaea
B. Fungi
C. Bacteria
D. Protista

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

your answer is rna to the question.

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.