Question

Which of the following structure is absent in mollusca animals?​

Answer 1

Answer:

Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda. The members are known as molluscs or mollusks[a] (/ˈmɒləsk/). Around 85,000 extant species of molluscs are recognized.[3] The number of fossil species is estimated between 60,000 and 100,000 additional species.[4] The proportion of undescribed species is very high.

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Answer 2

Answer:

please mention the following structure I can't answer this like this