What feature of animals enabled them to diversify in ways that plants, fungi, algae, and protozoans have not?

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Organ systems enabled animals to specialize and adapt to different environments and lifestyles, leading to their diversification in a way that plants, fungi, algae, and protozoans, which lack true organ systems, have not been able to achieve to the same extent. Radial and bilateral symmetry and phylogenetic analysis are important concepts in animal biology but do not directly relate to their ability to diversify.

What Feature of Animals Enabled Them to Diversify in Ways