The documentary presents a series of possible "intermediary steps" in the formation of a complex eye organ. Explain why natural selection would favor each of these changes, and give an example of a modern organism that still relies on that design.

Cup-shaped vision organ, compared to the primitive flat patch of sensory cells.

the peripheral nervous system or pns contains the nerves, which leave the brain and the spinal cord and travel to certain areas of the body. the peripheral nervous system's main job is to send information gathered by the body's sensory receptors to the cns as quickly as possible.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.