Utilise Porter's Five Forces model as a strategic instrument to critically dissect the dynamics of the competitive environment across Alphabet's various sectors, inclusive of AI, life sciences, and autonomous vehicles. You should devote meticulous attention to each force, evaluating the dynamics and power relationships within the industry. Rather than reproducing the information in Exhibit 4, examine in depth how Alphabet's structural composition may impinge upon these dynamics and power relationships. Proceeding from your analysis, provide a scholarly evaluation of Alphabet's corporate strategy across its myriad ventures. Identify instances of cost leadership, differentiation, or focus strategies and discuss their ramifications in the context of the broader competitive landscape