Teeth are a great way to discover when an organism existed and based on the shape, figure out what they ate. Shubin describes that many of the hard structures of organisms, such as bones and armor, originated from teeth. Without the development of teeth, organisms would not have feathers, hair, or even mammary glands. Shubin moves onto the head describing that every vertebrate animal starts with four arches (Branchial arches/gill arches) which develop into different functions, concluding that we are all modified sharks. Shubin moves onto the nose and the sense of smell. 3% of our genome is devoted to the sense of smell which is why we are able to smell and identify around 10,000 unique smells. Not only are there two different proteins which determine whether an organism can smell in water or in the air but like other gene traits, scent genes can be tracked by mutations because there is a limited amount of change that can occur and creatures who are more related to each other have lost similar scents as a result of
Teeth are a great way to discover when an organism existed and based on the shape, figure out what they ate. Shubin describes that many of the hard structures of organisms, such as bones and armor, originated from teeth. Without the development of teeth, organisms would not have feathers, hair, or even mammary glands. Shubin moves onto the head describing that every vertebrate animal starts with four arches (Branchial arches/gill arches) which develop into different functions, concluding that we are all modified sharks. Shubin moves onto the nose and the sense of smell. 3% of our genome is devoted to the sense of smell which is why we are able to smell and identify around 10,000 unique smells. Not only are there two different proteins which determine whether an organism can smell in water or in the air but like other gene traits, scent genes can be tracked by mutations because there is a limited amount of change that can occur and creatures who are more related to each other have lost similar scents as a result of