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Explanation:

The quantity of oxygen in the atmosphere influences the development trajectory, cardiovascular allometry, and metabolic rate of the American alligator. The growth of hypoxic alligators is hampered by a lack of oxygen in the atmosphere, which may impair their food use capabilities.
Recent palaeoatmospheric models suggest large-scale fluctuations in ambient oxygen level over the past 550 million years. To better understand how global hypoxia and hyperoxia might have affected the growth and physiology of contemporary vertebrates, we incubated eggs and raised hatchlings of the American alligator. Crocodilians are one of few vertebrate taxa that survived these global changes with distinctly conservative morphology.

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