Based on their name you can guess that the Aplacophora have
a many part (greater than 2) shell
a two part shell
NO shell
a one part shell

NO shell

Explanation:

Aplacophora have no shell, at least not in their current form. They are molluscs that are found in all four oceans. Aplacophora have different species (around 320) which are subdivided into two groups which are Solenogastres and Caudofoveata.

Alpacophora are generally small in length even though some can grow to 12in and can be confused for worms at first because they are worm-like.

haploid cells;