Question

Which two statements are true about a system?

1. A system is a group of objects analyzed as one unit.
2. Energy that moves across system boundaries is conserved.
3. There’s only one way to define the boundaries of a system.
4. All systems are made by humans.

Answer 1

the 1st is correct and the 2nd is also correct as it should obey the Law of Conservation of mass.

Answer 2

The answer is A because a system is actually made up of different parts working together as one unit. A phone is an example of a system because it is made up of parts that work together such as the processer and graphics card.