The eye was cited by many as a "perfect" organ. how is the eye actually imperfect, and why are these imperfections important to understanding its evolution?

 If the eye were perfect, all organisms with eyes would distinguish the same colors, there wouldn't be any issues with vision, and the placement of the eye would be the same for all. These imperfections are important because they can provide answers to evolutionary traits. For example; Deer have eyes on the sides of their heads. This is due to their need to see all around them, in order to watch out for danger.

1. when the tempature rises,your sweat glands and then springs into action making perspiration. some sweat evaporates with your skin taling heat with it.2.some of the blood pumped by the heart travels by your lungs to get rid of carbon dioxide and pick up oxygen.3.saliva produces by, you drinking water which saliva is 98% of. when mucus builds up in your body it also creates saliva as well as, antibacterial compunds.4.when the core body tempature drops, the shivering reflex is triggered to maintain homeostasis. for example: when you get out the pool you start to shiver because it is cold.