8. Humans have been selecting maize for desirable characteristics ever since domestication of the crop began.
Figure 1 below describes the traits of maize cobs found in four archaeological deposits from the Tehuacán
cave in Puebla, Mexico. Rachis diameter refers to the diameter of the cob at its base. Average number of
rows refers to the number of rows of kernels per cob.
a. Which archaeological layer contains the oldest maize remains? The youngest?
b. Use data to compare and contrast the oldest and youngest maize cobs in the archaeological record.
I