This is the correct answer as to to <span>what extent has the presence of a true coelom in animals changed over the course of evolution:
</span><span>the presence of absence of a true coelom appears to have changed mutliple times during the course of evolution</span>
This policy was called "containment" - the idea was to contain communism from spreading to new countries without trying to actively challenge the communist system in the countries that already had it.
This policy lead to some proxy wars, in which the US fought the Soviet Union for the free countries.
Some of the events leading up to the Boston Massacre are noted below. British troops had been stationed around Boston, so that officials representing the British crown could enforce unpopular legislation and this created even more tension. A mob had formed around the British soldiers and shouted verbal abuse at them and harassed them. This eventually led to the Boston Massacre.
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.
