Public Health

I just need these questions answers to the best of your ability.
Reflect on what you have learned about public health the last few weeks, and the current state of the pandemic in the US.

1.    Why is scientific evidence necessary to advance public health knowledge of COVID-19 transmission (spread) prevention guidelines?  Give an example of a prevention guideline and the way in which evidence determined the guideline. (Length: approx. 200 words)

2.    Why is scientific evidence necessary to advance public health knowledge of COVID-19 isolation or quarantine guidelines? Give an example of a guideline and the way in which evidence determined the guideline. (Length: approx. 200 words)

3.    What do you think the COVID-19 pandemic would look like in the United States if we did not have evidence to support public health guidelines? Why? (Length: approx. 200 words)

This is for my public health class so please if you have any questions about materials and notes please ask me questions. Also please reach the required word limits.