I believe it is oxygen and carbon dioxide
There are various diseases and disorders that could arise from high levels of saturated fat and specfically bad cholesterol. From the renowned, cardiac arrest, atherosclerosis, hepatic steatosis, neurological diseases like cerebrovascular diseases; ischemia and hemorrhagic stroke, disoriented weight size and gain -obesity is also caused by the high concentrations of fat and bad cholesterol.
These disorders and complications are just the few of the many possible outcomes of the mentioned imbalance of fat. How? because there is too much lipid for the body to process and metabolize thus, breach of homeostasis.
These animals were living in an environment with a warm climate that results in changing sea levels. These conditions create a lot of shallow inland seas allowing these animals to thrive. The Cretaceous period is the last period of the Mesozoic area where new groups of mammals, birds, and flowering plants appeared on Earth.
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The answer in this question is Phrenology. Phrenology is classified as the discredited pseudoscientific theory of the brain that claimed that moral character, personality characteristics and intelligence could be determined by examining the bumps on a person's skull. Phrenology is focused on the measurements of the human skull which is based on the concept of the brain is the organ of the mind.