can be both an atom and a molecule. A) Hydrogen A) Helium

Hydrogen

Explanation:

Because helium is a noble gas with a full valence shell, it does not bond with other atoms readily. This means that it cannot be a molecule. However, hydrogen can bond with a lot of things, because of its unique property of having just one electron, meaning that it can donate or accept one, making it able to easily become a molecule. Hope this helps!

"griffith's experiment discovering the "transforming principle" in pneumococcus bacteria. griffith's experiment, reported in 1928 by frederick griffith, was the first experiment suggesting that bacteria are capable of transferring genetic information through a process known as transformation." - griffith's experiment.

the answer is b.) hydrogen bonds between bases.