Answer:
. CuO
Explanation:
Since oxygen also has -2 the valency will cancel out the +2 on Cu leaving CuO
it would be B because warm humid air+cool land=fog
<span>By studying fossils, scientists get an idea of what the organisms looked like, what they ate, and how they lived. </span>
Either C or D. Those r the answers that make more sense.
<span>There is no chemical reaction between potassium nitrate and water. Potassium nitrate dissolves in water, which is a physical change.</span>
