A heat engine converts thermal energy into what?

1. chemical energy
2. potential energy
3. electrical energy
4. mechanical energy

What is a cordon and where is it found

In what for do plants utilize nitrogen? why do they need nitrogen?

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass