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Process and Result
What are you telling your kids on the car ride home? That car ride home has much more impact than you know. Are you focusing on the end result, or are you excited to use that time to help your child develop into a champion? It's very simple: you're focusing on the end result if you ask questions about the end result.
But evolution knows about risk-benefit ratio. And so evolution wants to maximize the chance of a beneficial outcome. And how do you maximize the chance of a beneficial outcome? You try to get the highest quality embryos. And how do you get the highest quality embryos? You make them work for it.
The forked ribs and the vertebral pneumaticity are two clues that we can hunt for in the fossil record, because these two skeletal traits would indicate that regions of the respiratory system of dinosaurs are immobilized. This anchoring of the respiratory system facilitated the evolution of the thinning of the blood-gas barrier.