The answer is proteins.
Proteins are made of amino acids and they determine each and every function of your body, from the process of digestion to the structure of your own hairs, even your eye and skin colour just everything. It depends on the polypeptide sequence of each protein as all have a different sequence and thus will lead to different types of bonding shapes, giving each and every protein of our body a function.
Answer:
how old the star is
Explanation:
There are many characteristics that affect the brightness of stars. If two stars are the same temperature, same age, and same distance from the Earth, the larger one will appear brighter. If the temperature, age, or size is different, the one closest to Earth will appear brighter, even if that is the smaller one.