<span>Because the bases can be arranged in many different combinations</span>
Temperature difference and Earth's tilt
Explanation:
Melanin is the pigment which absorbs UV light and it is present in skin and gives black colour to it.As we can see africans usually have black skin as they have to face direct uv light.
They have the same mass as the mass of the reactants. evidence to back this up is the law of conservation of mass
