Major phyla - PowerPoint PPT Presentation

IV. Early Life

IV. Early Life - the first cells were probably heterotrophs that simply absorbed nutrients and ATP from the environment. - as these substances became rare, there was strong selection for cells that could manufacture their own energy storage molecules.

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INTRO TO THE ANIMAL KINGDOM

INTRO TO THE ANIMAL KINGDOM. What is an Animal? . Characteristics of All Animals 1. Animals are Multicellular 2. Animals are Eukaryotic 3. Animals are Heterotrophs 4. Animal cells lack cell walls. Evolutionary/Developmental Milestones in Animals.

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