What do the arrow-shaped symbols in the second ring of the Aztec calendar represent?

Four Olin representing the Earthquake Epoch or Sun. The four epochs represented inside the square portions of this symbol correspond to the four previous epochs also called suns. Second Ring – The second ring from the center is composed of 20 named days contained in one month, also used for naming years.

Explanation:

i would say b probably

answer; ///it examines the interaction between genetics and culture in shaping human biology;