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According to one hypothesis , the " sculpted " or " ornamented " dermal skull roof bones found in early tetrapods may have been related to a mechanism for relieving respiratory acidosis ( acidic blood caused by excess CO ) through compensatory metabolic alkalosis .
 respiratory acidosis, metabolic alkalosis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 respiratory acidosis, metabolic alkalosis