Gap Fill - Chicken and Egg - Level 4

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   embryo      genetics      insights      life      nature      organism      problem      simpler      time      whereas   

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The was first discovered in 2017. It has offered many into ancient life. A researcher said it "allows us to go back in a billion years". The behind egg fertilization and development were present before animal existed. This means made eggs before chickens arrived. A answer to the chicken and egg is that chickens appeared 10,000 years ago, eggs arrived millions of years ago.

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