Do you feel like you’ve lived this same day many times before?

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.

Balanced rock sits on a thin spike of rock in a canyon what forces keep the rock balanced on its tiny pedestal

The tendency to seek out individuals who represent the same level of physical attractiveness as ourselves is explained as