What primitive form did nucleic acids take?
- polypeptides
- deoxyribonucleic acid
- ribonucleic acid

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."