Answer:
element Y and Z
Explanation:
Having on valence electron indicates that these elements are on the same column/group of the periodic table. Both these elements will bond with a -1 charge.
The term is nitrogen fixation.
UV light could change the DNA of the skin cells of the organism, possibly causing cancer cells to form.
It took 1649 <span>took </span><span>for the world population to double, going from .25 billion people to .50 billion people.</span> years.