Which art style was characterized by simple forms made from naturall materials

Name the painting above and its artist. what media was used to create this piece? why do you think the artist chose to use this media for this piece?

David is preparing a presentation on art history. complete the sentence to david describe a significant change in christian art

Behaviorists focus on behaviors that.. a are observable b are caused by unconscious desires and conflicts c people become consciously aware of d can be categorized into a theoretical system