The single cell that starts the cell divides over and over again to make all the cells that the organism has when in adulthood. ... In the middle of the atom there is a nucleus. ... Electron are not in the nucleus like the protons and neutrons are. ... The energy levels are like orbits that surround the nucleus. ... It contains one proton and one neutron in the nucleus. ...

• Word Count: 4152
• Approx Pages: 17
• Grade Level: High School