Class 10

We started Unit 2 on the theory of evolution. We discussed the evidences for evolution the earths shift through time and live in the different eras. We watched videos about the plates of the earth that moved the land through time until it formed what we have today. We learned about how fossils are formed and the rock layers that make a well preserved fossil. We also discussed transitional fossils that played a major role in the evidence for evolution. Transitional fossils are fossils found that are between two different species such as the eupodophis which is a transitional fossil between a monitor lizard and a snake. We looked at a particular transitional fossil called the Tiktaalik at the Webb Schools museum. The Tiktaalik displays a transition between a fish and a land animal. The changes in its bone structure, ribs, legs, arms eyes and tail shows the adaptation to land and water, It had a bone structure in its limbs close to a humans and had a push up motion to move through obstacles in mud and water. It lived in shallow waters and its eyes shifted to the top of its head to see in and out of the water. Its ribs are expanded so it could lay on land or move through obstacles in water. Its diet consisted of bugs and small fish as it could find food in and out of the water.