Why do the cells in all living things need energy?

It needs energy so living things can be able to move, maintain our body temperature, and build large molecules. Since food is chemical energy for living things, cells need oxygen so it can release energy form the food. That process will be called aerobic respiration.

Hope this helps! :)

10.063g / 10.00 ml = 1.0063 g/ml which rounds off to 4 sig figs as: 1.006 g/ml