Your Inner Fish Body Paragraph 2

In Your Inner Fish, An entire chapter is devoted to teeth. Teeth are incredibly useful when studying fossils because they are hard features that easily fossilize. In fact teeth are sometimes the only hard parts of animals to fossilize. Shubin includes personal anecdotes regarding his search for fossils, including finding some of the earliest known specialized teeth. Shubin does not only talk of his incredible fossil discoveries, but also the entire history of life. There are numerous reasons as to why it took so long for multicellular life to proliferate. Firstly, the conditions must be right, the environment must be suitable for life and contain enough oxygen to meet energy demands. Multicellular life takes significantly more energy than unicellular life.