Yes, the specific heat capacity of substances change when there is a change in temperature. At molecular level, the internal energy of a substance is stored in form of translational, rotational and vibrational energy. It has 3 degrees of freedom for each form of energy. In lower temperature ranges, say below 1000 degree celsius, vibrational energy is insignificant.
They both excrete wastes. meaning they both are able to release waste.
Because we would die without oxygen
I believe it is centrioles.