Which of the following best explains the central role of carbon in the chemistry of living organisms?

a. carbon forms many molecules with ionic bonds
b. carbon forms many molecules with convalece bonds
c. carbon forms many molecules with hydrogen bonds
d. carbon can only bond to other carbon atoms

The answer to this is B i think but i'm not sure 

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the