Is animal dung a fuel

What type of specimens where you able to see under each of the microscopes in the microscope activity

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

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?