Which tenet of the cell theory is being demonstrated by the graph below? A.) cells can never be destroyed B.) cells are the smallest unit of life C.) all living things are made of cells D.) cells come from existing cells

The cell theory demonstrated by the graph above is that all cells come from pre existing cells.

a. by using fur or clothes to trap heat energy near the body

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.