All of the following are characteristics of mayan society except
a. a separation of political and religious authority.
b. skilled artisans, officials, and merchants.
c. a class of nobles and scribes who the rulers.
d. a majority of people who were farmers.

Which of the following describe the role a biochemical pump plays in active transport? a it prevents water from moving across the cell membrane. b it uses energy to move materials across the cell membrane against the concentration gradient. c it large molecules cross the cell membrane without using energy. d it a cell move molecules from an area of higher concentration to an area of lower concentration.