Common ancestry and evolutionary trees
5:33
Common ancestry and evolutionary trees
Aug 30, 2022
Khan AcademyKhan Academy
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,
0:06
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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