Which scientist(s) discovered the basis for the base-pair rule, which states that the amounts of adenine and thymine match, as do the amounts of cytosine and guanine?

Erwin Chargaff.

Explanation:

Rule of Chargaff was that any cell organism from the DNA should maintain a ratio of 1:1, this ratio rule is called base pair rule.

And this ratio is maintain between pyrimidine and purine bases and the amount of cytosine should be equal to guanine and also the amount of thymine should be equal to adenine.

Both type of DNA strands show this pattern and this rule was discovered by a chemist  who belong to Austria, named was Erwin Chargaff.

the answer for apex is the lowest

iron would move it is magnetic there is a mag field around the current in the wire