3. which of the following is a major part(s) of the cell theory?

a. all organisms are composed of one or more cells.

b. all cells that currently exist have originated from pre-existing cells.

c. cells are the most basic structural and functional unit of life.

d. all cells possess dna enclosed within a nucleus.

C

Explanation:

telophase and anaphase

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.