This class is the first class for our 2nd unit, and the topic for this unit is evolution. In the book "Inner Fish", the author mentioned the importance of tiktaalik, a type of species that lived millions of years ago. The tiktaalik is crucial to the course of evolution because it is a key link for us to find out how marine animals evolved into land animals.
Tiktaalik had features that helps him to survive both in water and on land. For land features, tiktaalik had limbs for doing push-up, and eyes on top of the head for larger vision. For marine features, the tiktaalik has scales and fins for swimming in water.
Today, we also learned that the sedimentary rocks are important for fossil preservation, and the deeper the layer is, the older the rock is. This is also how paleontologists look for fossils in different periods.
- Andy Liu '15
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