____ took a fundamental step forward in his representation of Saint Mark by the contrapposto pose

Homo sapiens appeared on the earth __________ years ago

A. 300,000 B. 400,000 C. 100,000 D. 50,000

In drawing, the outer boundaries of two-dimensional forms are defined by ________, while the outer boundaries perceived among three-dimensional forms are defined by ________

A. graphite; ink B. visual elements; principles of design C. outlines; contour lines D. thick lines; thin lines E. actual lines; implied lines