Anyone tryna chat? im bored lol

In a compound condition, both conditions on either side of the logical operator and must be true for the overall condition to be true. a: true b: false

Suppose an astronomer discovers a large, spherical-shaped body orbiting the sun. the body is composed mostly of rock, and there are no other bodies sharing its orbit. what is the best way to categorize this body? a. planet b. moon c. comet d. asteroid

Which of these is most responsible for differences between the twentieth century to the twenty-first century?