It would be a catalyst. They help increase the rate of chemical reactions.
Answer: i feel like color and size should be switched.
Explanation:
It is NOT C, I got that wrong when I chose C.
I believe the correct answer among the choices presented above is the last option. It is in the Sahara desert that most-likely there is physical water scarcity. This is because it is a desert and it is a characteristic of a desert to have very small or no amount of water. Also, the climate their is very hot.
