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The diagram illustrates a simplified evolutionary tree (phylogenetic tree) showing the relationship between different groups of reptiles and birds, highlighting when eggs and chickens first appeared. Here’s a breakdown: 1. Eggs Already Existed: The arrow pointing to “Eggs already existed here” refers to the fact that egg-laying as a reproductive strategy originated long before chickens appeared. The amniotic egg, which has a protective shell, evolved in the common ancestor of reptiles and birds,

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The diagram illustrates a simplified evolutionary tree (phylogenetic tree) showing the relationship between different groups of reptiles and birds, highlighting when eggs and

Science Is Fun For Everyone. . The diagram illustrates a simplified evolutionary tree (phylogenetic tree) showing the relationship between different groups of reptiles and birds, highlighting when eggs and chickens first appeared. Here’s a breakdown: 1. Eggs Already Existed: The arrow pointing to “Eggs already existed here” refers to the ...

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