Correct Answer: Option B

Explanation

It is believed that insects are so successful because they have a protective shell or exoskeleton.

Insects are considered the most successful invertebrates due to their remarkable ability to adapt to diverse environments, primarily because of their hard exoskeleton for protection, small size allowing them to occupy various niches, efficient flight capabilities for dispersal and finding food, and rapid reproductive rates, enabling them to thrive in large numbers across the globe. 

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