Radon is colorless at standard temperature and pressure and it is the most dense gas known. At temperature below it's freezing point is has a brilliant yellow phosphorescence. It is chemically nonreactive, it is highly radioactive and has a short half life.
Answer: The flagella are like legs . The pili are like DD2 arms and legs . The cell wall is like the skeletal system. The ribosomes are like carpenter. The nucleoid is like the brain. The cell membrane is like skin. The cytoplasm is like blood.