A chemical reaction is the only way to separate an?
element
pure substance
mixture
solution
Mark this and reti

 Mixture

Explanation:

If there is and unstable element composition of say, pure graphite an un-pure gold then a chemical reaction will most likely be used to separate the two elements.

i'd say that the moon rock is about 2.2 billion years old.

for 8 am not sure maybe yes?

for 9 if it is asking if the male is more or less it would be less

hope i even just a little : )