How are proteins and nucleic acids related? They both provide energy.
They both carry genetic information.
The structure of proteins is determined by nucleic acids.
The subunits of nucleic acids are also the subunits of proteins.

equal distribution i think.

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

it depends on how much it could carry.

the peaceful equids (horses, donkeys and zebras) were enslaved by the human race to do our bidding -- sorry, domesticated -- several thousand years ago, and since that time they've been an invaluable resource for transportation, agriculture, warfare, companionship and sometimes-horrifying entertainment.