Which organism did Haeckel not classify?
Protista
Mammals
Birds
Reptiles
Answer
Haeckel was a German biologist who created a system for classifying organisms. However, he did not classify mammals. Mammals are a group of animals that are warm-blooded, have fur, and give birth to live young. Haeckel believed that mammals were descended from reptiles, and he did not believe that they were a separate group of animals.
Exploring the Extraordinary: The Remarkable Life of Ernst Haeckel
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