Solved by a verified expert:I need a four page essay. This is the topic: The evolution of the jaw provided vertebrates with a new and more effective method of feeding. How did the vertebrate jaw develop through modification of pre-existing structures? What changes in gene expression and developmental pathways were necessary? What does the field of evo-devo tell us? Kuratani, S. 2004. Evolution of the vertebrate jaw: comparative embryology and molecular developmental biology reveal the factors behind evolutionary novelty. J. Anat. (2004) 205, pp335–347. The journal article will be attached.