For which of the following activities might you want to hire a chemist?
Answer: D. testing a rock sample for gold content
Which of the following procedures involves a physical change in one of the substances?
Answer: C. separating a salt solution by evaporating the water
<span>A)photosynthetic bacteria</span>
Answer:
no, Charon is significantly smaller than Mercury
The temperature decreases because there is no ozone in the mesosphere and the amount of air is decreasing.
