Which of the following statements about butterflies is correct?

• A. Butterflies have an external skeleton called an exoskeleton.
• B. Butterflies lack any form of skeletal support.
• C. Butterflies have a cartilaginous skeleton similar to sharks.
• D. Butterflies have an internal skeleton made of bones.

Answer: (A)

Verified step by step guidance

1. Understand the question: The problem asks us to identify the correct statement about the skeletal structure of butterflies. This requires knowledge of the anatomy of butterflies and their classification as arthropods.
2. Recall the biological classification of butterflies: Butterflies are insects, which belong to the phylum Arthropoda. Arthropods are characterized by having an exoskeleton, segmented bodies, and jointed appendages.
3. Analyze the options: The first option states that butterflies have an external skeleton called an exoskeleton, which aligns with the characteristics of arthropods. The second option, 'Butterflies lack any form of skeletal support,' is incorrect because arthropods rely on their exoskeleton for structural support. The third option, 'Butterflies have a cartilaginous skeleton similar to sharks,' is incorrect because cartilaginous skeletons are found in vertebrates like sharks, not insects. The fourth option, 'Butterflies have an internal skeleton made of bones,' is also incorrect because insects do not have bones or internal skeletons.
4. Confirm the correct answer: Based on the analysis, the correct statement is that butterflies have an external skeleton called an exoskeleton. This exoskeleton is made of chitin, a tough and flexible material that provides protection and support.
5. Conclude the reasoning: The exoskeleton is a defining feature of arthropods, including butterflies, and it plays a crucial role in their survival by protecting their internal organs and providing attachment points for muscles.