interstellar cloud of dust, hydrogen, helium and other ionized gases.
B. One
I believe that earth is the only planet that has life that we know of on it.
Number 4. 1 and 2 are both wrong. Copper is a metal and sulfur is a nonmetal. And when a bond is made, energy is stored.
<span>the behavior of the above pair of substances</span> is soluble
Answer:
because they react with other gases of atmosphere and pollute the environment
