Question

how we can says that Human beings are made up of Carbon

Answer 1

there are many evidences which tell that earth is mainly made up of carbon compounds therefore it might be true that humans are also made of carbon

Answer 2

water is made up of oxygen and hydrogen atom protein are made up of carbon hydrogen oxygen and other element so we know that make up the cells of the body are made of atom in this way we can say that human body is made up of carbin