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An animal which periodically casts off i...

An animal which periodically casts off its exoskeleton is

A

Unio

B

Fish

C

Fasciola

D

Cockroach.

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Exoskeletons**: - Invertebrates, particularly those in the phylum Arthropoda, possess an exoskeleton made of chitin. This structure provides support and protection. 2. **The Process of Molting**: - Arthropods periodically shed their exoskeleton in a process known as molting or ecdysis. This is necessary for growth, as the rigid exoskeleton does not expand. 3. **Examples of Molting Animals**: - Various arthropods undergo this process, including insects (like cockroaches), crustaceans (like crabs), and arachnids (like spiders). 4. **Identifying the Animal**: - The question asks for an example of an animal that periodically casts off its exoskeleton. A common example of such an animal is the cockroach. 5. **Conclusion**: - Therefore, the answer to the question is that an animal which periodically casts off its exoskeleton is a **cockroach**. ---
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