How do animals get the carbon atoms to form the co2 molecules that they exhale ? a: from oxygen they take in b: from glucose they eat c: from carbon dioxide they inhale

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