The main part of the mollusk's body is called the _____ mass.

visceral
crust
polyp
tail
medusa

visceral

Echinoderm

A)an ocean invertebrate with spiny skin
B)an animal having no backbone
C)an invertebrate animal with jointed legs and an exoskeleton
D)an invertebrate animal that has tentacles around its mouth
E)an outer covering that supports the soft inner tissues in an arthropod

A)an ocean invertebrate with spiny skin

The main part of the mollusk's body is called the visceral mass.

To find this answer, you can start by understanding the definition of a mollusk, which is a type of invertebrate animal with a soft body, typically enclosed in a hard shell. Mollusks include animals such as snails, clams, octopuses, and squids.

Knowing that mollusks have a soft body, you can then look for information on the different parts of their body. The main part of a mollusk's body is often referred to as the visceral mass. This term describes the portion of the body which contains the mollusk's organs such as the heart, digestive system, and reproductive organs.

Therefore, the correct answer is visceral.