Answer: Mg2+
Explanation: ATP(Adenosine triphosphate) is unstable in nature and also shows the property of being electronegative. It is seen that 
is the electronegative element and it is bonded with the Mg2+ being a positive divalent and thus achieve the stability and reducing the electrostatic repulsion.So, there is the combination between the negatively charged phosphate groups with the Mg2+. Therefore option (a) is the correct answer.
Reference point .................................
I and III.
Chargaff's law and Rosalind Franklin's discoveries
Ionic, Covalent, and Molecular I'm sorry if I got this wrong but I think this is right because molecular is an example of covalent
<span>Cloning is the process in biotechnology which refers to creating copies of DNA, cell and living beings and produce new organisms. At the beginning the cloning was done on female cells until proven wrong when process is done on a rat which was called as Fibro.</span>
