To convey the three dimensionality, mass and volume of forms on a flat surface varying shades of light and dark . What is the name of this technique

What is the purpose of the cc option in an email? a. create a carbon copy of the message. b. save the message as a template for future use. c. send a copy of the message to one or more people. d. send a message to multiple recipients.

Match the instrument with its classification group: trumpet idiophone piano chordophone cowbell membranophone snare drum aerophone

Need some ! asap i need to figure out 3 major changes in bridges over time and why these changes to adapt to both improvements in technology and changing social links would also alot.