Sherri is processing lab data on the locations of retinal activations in the brain. she notes that even though the fovea accounts for only 0.01 percent of the retina's area, signals from the fovea account for 8 to 10 percent of the retinotopic map on the cortex. this apportioning to the small fovea of a large area on the cortex is known as

cortical magnification factor

Explanation:

The area representinf the cone-rich fovea is much larger than one would expect from the fovea's small size.  The cortical magnification factor in the human cortex has been determined using a technique called brain imaging, which makes it posible to create pictures of the brain's activity.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: