The species diversity of plants (22%) is much less than that of animals (72%), what could be the explanation to how animals achieved greater diversification?

(1)Animals are non-motile
​(2)Their movement to diverse habitats resulted in more evolutionary changes occurring in animals
​(3)Animals use carbohydrate and lipid as a source of energy
​(4)Animal DNA is different from plant DNA in terms of type of nitrogen bases.

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The correct answer is 
(2)Their movement to diverse habitats resulted in more evolutionary changes occurring in animals.

The large difference in the species diversity of plants and animals shows that animals have adapted themselves to ensure their survival in changing environments in comparison to the plants. They have developed a complex nervous system to control and coordinate their body structure and other external features that have given them the ability to survive in various habitats as compared to other. 

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