Learning is more likely to stick when your motivation is: extrinsic intrinsic obligation stress

To make an etching the artist first coats the entire printing plate with an acid-resistant substance called a made from beeswax, asphalt, and other material. the artist then draws on the coated plate with an etching needle exposing the metal. next the plate is dipped in the plate is removed, the waxy coating removed, and the plate is cleaned, inked and printed.

Asnap is a three-dimensional form or a two dimensional form?

For the difference command to work, what needs to happen?