Why do frog eggs have proportionately less yolk than bird eggs?
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The larvae inside frog eggs are able to get their own nutrients better than birds. Therefore, they do not need as much yolk for nourishment.
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Hot chambers also spent 3.7 more hours at lethal incubation temperatures (above 40.5◦C) than did cool chambers. ... "These birds usually like to incubate their eggs in temperatures between 36-40◦C, and there is evidence suggesting that prolonged temperatures of over 40.5◦C can be lethal to the developing chick embryos
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