Your Inner Fish Chapters 9-10

CHAPTER 9
"Our eyes have a history as organs, but so do eyes' constituent parts, the cells and tissues, and so do the genes that make those parts." (page 149)

This shows how eyes have evolved from tissues into a major organ of humans today.

"Our eyes, like those of every creature with a skull and a backbone are like little cameras." (page 149)

This shows the relevance between humans and different mammals and creatures.

"The amount of light that enters the eye is controlled by a diaphragm, called the iris, which dilates and contracts by the action of involuntary muscles" (page 150)

This shows the function of the iris within the human eye.

"Our camera-like eye is common to every creature with a skull, from fish to mammals" (page 150)

This shows how eyes have a correlation to every creature and emphasize the effects of evolution.

"The key to understanding the history of our eyes is to understand the relationship between the structures that make our camera-eye and those that make all the other kinds of eyes." (page 151)

This emphasize the relevance between different creatures through their similar structures as well as shows how evolution has taken place through time.

"Animal eyes come in two flavors; one is seen in invertebrates, the other in vertebrates, such as fish and humans" (page 154)

This shows how eyes come in a variety of forms due to evolution.

"We now know that eyeless, or Pax 6, controls development in everything that has eyes" (page 156)

This shows how Pax 6 plays an essential role towards the development of eyes in numerous creatures.

CHAPTER 10

"The part of the ear we can see, the flap on tip of which we hang our glasses, is a relatively new evolutionary addition to bodies." (page 159)

This shows how humans have evolved in order to gain essential and non-essential addition features.

"The elegance of our connection to sharks and bony fish is revealed when we look inside our ears." (page 159)

This shows the connection between humans and sharks through ears.

"As we've seen, each of these ear bones is derived from the gill arches: the stapes from the second arch, and the malleus and incus from the first arch." (page 160)

This shows the evolutionary path our ear bones essentially went through in order to evolve from gill arches from fish to adaptable features for the human body.

"The explosive bit of information, thought, was that the other middle ear bones of mammals, malleus and incus, evolved from bones sets in the back of the reptilian jaw" (page 161)

This shows how ear bones in mammals essentially evolved from the bones of an ancient reptile.

"Despite the apparent differences in the function and shape of these bones, the similarities between hyomandibula and the stapes extend even to the nerves that supply them" (page 162)

This demonstrates how ears have similarities in various creatures despite differences in function and shape, emphasizing biological relevance.