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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The egg contains all of the materials that will become those different tissue types. But they are unassembled like a pool full of loose legos. The first few chicken cells of a fertilized egg have the machinery to start assembling those “legos” into more and more complex cells. Eventually you get to a point where there are specialized cells with the right machinery to make the blood, bones, muscle, feathers, brain, and every other distinct tissue type of a baby chick.
Then after birth, of course, the chick will have to start finding food to keep making more of itself.
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