The difference between groups in a meta-analysis is represented by the letter __________

As we view the world, objects often appear to stand out against a backdrop. This is the Gestalt principle of _____

a) similarity. b) proximity. c) figure-ground. d) continuity.

Species that sleep a lot tend to

A) be more active. B) have higher body temperatures. C) be small. D) be protected from predation when they sleep. E) all of the above