Animal Development: We're Just Tubes - Crash Course Biology

The video explores animal development, focusing on the transformation from a single cell to a complex organism. It discusses the classification of animals based on complexity, symmetry, and tissue layers. Key processes like gastrulation and the formation of germ layers are explained. The video also touches on the recapitulation theory, highlighting its historical context and misconceptions. Overall, it emphasizes the interconnectedness of life and the fascinating journey from a simple cell to a fully developed animal.

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