When an egg is layed, how does the flech, blood, bones etc form? Are they formed from scratch? or is the existing material inside the shell is the flesh and bone but just in the right shape yet?
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A fertilized egg contains an embryo, and yolk.
The embryo’s genetic code is what instructs its cells to grow and divide and develop into a full fledged animal. The embryo eats the yolk to gather the matter it needs to grow. When the animal is fully developed, all the yolk is consumed and the animal breaks out of the egg
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