Question

Carbon is important to life because _________________________.

Answer 1

A. it can take the place of hydrogen in many compounds

B. it is the only molecule that can bind to hydrogen

C. it is rare and, therefore, valuable to living things

D. it can form four bonds, and is capable of building large molecules

Answer 2

D

Answer 3

Heena is right. Carbon needs four valence electrons to complete its octet; it also has four valence electrons it can share with other atoms. It can do this by forming anywhere from single up to triple bonds - so it can be used as a basis to form very large and very complex molecules.