Which two forces act directly on objects that are unable to be viewed by the unaided eye?

What is the definition of navajo code talkers?

Historians believe that animals drawn in cave paintings during the paleolithic era could have represented each of the following except a a. successful hunt b. domesticated pet c. god that was worshipped d. way to obtain an animal's spirit select the best answer from the choices provided

What were some of the new consumer appliances that americans could purchase in the 1920s