Answer:
I believe that the first one was it established a direct trade between portugal and india
Explanation:
This new labor system was called sharecropping.
I can list a couple for both I guess.
Opening:
People getting infected, angry parents, school administration being flamed and you can be fired potentially, a negative thing from my perspective.
Closing:
Very low risk for students being infected, work from home, more time for students to rest, meaning a overall positive thing in my opinion.