10. Which of the following consists of two or more pure substances? A. ice
B. oxygen
C. soda pop
D. ammonia​

If we take two or more pure substances and mix them together, we refer to this as a mixture. Mixtures can always be separated again into component pure substances, because bonding among the atoms of the constituent substances does not occur in a mixture.

I think oxygen is your answer

A. Avoiding situations where drugs will be present is the on of the helpful strategies in avoiding drug use.