In this task, you are given a paragraph, and your task is to construct a question from the given passage. Construct question in such a way that (i) it is well explained in the paragraph, (ii) the words may/may not be present in the paragraph, (iii) it should start with what/how/describe. Avoid creating a question that (i) is just relevant to one or two sentences, and (ii) not relevant to passage. 

Light enters the eyes. The lens focuses light through the vitreous humor. The cornea focuses through the eye's internal lens. The retina receives the image. The retina transforms this image into electrical impulses. The impulses travel along the optic nerve to the brain. The brain decodes the impuses. 
How does the human vision system work?

A bird lays an egg. The egg hatches into a baby bird. Baby bird eats. Grows into an adult bird. The bird finds a mate. The pair build a nest. The birds lay eggs. 
Describe the life cycle of a bird

You wash the wound. You apply a bandaid or other covering if needed. The blood clots. A scab forms. The skin repairs itself under the protective cover of the scab. The scab falls off. 

Describe the steps in how a cut on your hand is treated and heals