Which has prokaryotic cells? 1. onion root 2. cow's liver 3. human blood 4. e. coli

E.coli consists of prokaryotic cells. A prokaryotic cell is a single-celled organism, generally a bacteria. E. coli is a bacteria that lives in the intestines of people and animals.

Explanation:

Prokaryotic cells are cells that don't have a real nucleus or most different cell organelles. Organisms that have being cells are living thing and known as prokaryotes. Microorganism and archaea are prokaryotes.

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.