True reptiles are cold-blooded, but I'm not sure about hybrids or whatever these things are. One thing that occurs to me is how we're told that birds are descendants of reptiles, yet they're warm-blooded. Questions abound.
The exact composition and structure of the carbonate varies based on the temperature at the time it [egg] formed. By analyzing this variation, researchers are able to determine what the body temperature of the animal was.
I'm not familiar with what you're talking about, however, I'm familiar with the temp of the egg determining the sex of the organism.
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