Question

what are the common elements of humans and space

Answer 1

The proportion of each element of life differed depending on the region of the galaxy in which it was found. For example, the sun resides on the outskirts of one of the Milky Way's spiral arms. Stars on the outskirts of the galaxy have fewer heavy elements required for life's building blocks, such as oxygen, than those in more central regions of the galaxy. 

Answer 2

hydrogen is the element which is present in both human and space.It constitute 0.5% in human and it is present as fuel in space.In hole hydrogen is common in both human and space.