Which of the following was the earliest step in the evolution of the vertebrate eye lens?
A) A patch of tissue folds inward into a cup beneath unpigmented skin.
B) The cup, the eye, becomes spherical and evolves greater acuity.
C) Unpigmented skin above a cup of tissue becomes transparent and can focus an image.
D) Light-sensitive regions bulge outward to the sides of the head.

Question

Quizplus · Accepted Answer

The earliest step in the evolution of the vertebrate eye lens was the development of light-sensitive regions that bulged outward, which eventually led to more complex eye structures.

Which of the Following Was the Earliest Step in the Evolution