I think it's DNA forms a double helix and RNA consists a single strand.
I may be wrong...
number 8 the list is hydrogen,magnesium,silicon and oxygen and there are 4elements
If I understand you correctly, you should fill the gap and decide which kind og bonds <span> allows metals to conduct electricity. If so, without any doubt I can say that the metalic bonds </span><span> allows metals to conduct electricity. I'm pretty sure it will help you! Regards.</span>
