Answer:
The description corresponds to an observational study.
Explanation:
In Observational studies, researchers observe the effect of a risk factor without changing what is exposed to it or its conditions. On the other hand, in an experimental study, researchers can introduce a change and study the effects of it.
The formula for finding density is p = m/v.
Answer:
because there are lots of colors and its very bright its also a natural thing so that makes seem even more pretty.
Explanation: