This has to do with blind spots: What parts of the eye are involved with this inability to see? How do these eye parts function? What is a practical way you can use this knowledge of not being able to see objects at a certain point?

Explanation:  

The blind spot is a region on the retina where ganglion cells connect with the optic nerve, and the optic nerve and blood vessels leave the eyeball. There are no receptors in this area so nothing can be translated into vision. That's why the blind spot is unable to see things.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

yes we can.   a lady urinates from her urethra.