Question

Molluscs differ from annelids in

• A. having a closed circulatory system
• B. having direct development
• C. having segmented body
• D. having unsegmented body

Answer 1

The correct option is D having unsegmented body

Molluscs differ from annelids in having an unsegmented body. The body of annelids is divided into segments.

In molluscs, an open circulatory system is present which lacks closed blood vessels. Blood directly bathes the tissues. In annelids, a closed circulatory system is present in which blood flows inside closed blood vessels.

In annelids and molluscs, development is indirect and includes a larval stage.