Question

____________ is the second largest phylum in animal kingdom.

Answer 1

Mollusca is the second largest phylum in the animal kingdom.

Molluscs have the following characteristics:

• They are bilaterally symmetrical.
• They are triploblastic; have presence of three germ layers.
  
• They show the organ system grade of organization.
• The body is soft and unsegmented.
• The body is covered by a mantle and shell.