Answer:
Universe: all of space and time (collectively referred to as spacetime) and their contents.
Solar System: gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly.
Galaxy: a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
Cluster: a group of stars formed closely
Constellation: a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure.
Number one is to use case to find out what happened to something
<span>the historical periods in which earth's population begin to rapidly rise is: B. Industrial revolution
After the industrial revolution, nations no longer conduct the act of war and conquest as an effort to increase a nation's wealth. As a result, the competition change in term of production. This cause the life expectancy of an average person is increaased and the number of population begin to rapidly rise</span>