Mollusks is one of the first animals to develop a true body cavity.
Explanation:
- True body cavity is also referred to as "Coelom". It is nothing but a hallow,fluid filled cavity that is found in almost all living organism which mainly functions as a protective cushion for all the internal organ of that organism.
- This body cavity also allows the organs of that organism to grow and move independently.
- In some animals or organisms such as worms,it also act as a skeleton.
- From the above provided options Mollusks is the animal that is seen to have developed a true body cavity.
- Mollusks is mostly of aquatic nature and it is named after a Latin word "Molluscus" which means soft. This soft body of them is covered and protected by the body cavity called Coelom.
Hence we can conclude Mollusks as right answer.
