Goals are nice to have, but not necessary. select the best answer from the choices provided t f

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.

By what percent will the product of two numbers change, if the first number increases by 70%, while the second number decreases by 40%.

Living organism in our word are connected to other variety of ways