Before ad 1100 which drawing surface was used in europe

Artists best achieve contrast in a composition by: a. drawing with realism b. shading a drawing with dark and light values c. using drawing techniques like stippling and hatching d. focusing on line and shape in a drawing

What does it mean to have a bias (for example your bias of bts)?

Afruit fly is heterozygous for both eye color and wing length (eeww). e is dominant for yellow eyes. e is recessive for white eyes. w is dominant for long wings. w is recessive for short wings. what would most likely be the distribution of phenotypes that this fruit fly could pass on in its gametes?