Carbon makes up part of all life forms on Earth. The human body, for example, is about blank % carbon.

Ithink it is quantity of plants

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

Ithink carbon dioxide, i am not completely sure.tell me if i am wrong.

A. is your answer.  hope this