Question

A new organism has been discovered. This organism has a bilaterally symmetric unsegmented body. It's capable of moving on its own with a muscular appendage and is encased in a large shell that seems to be attached to its body. Based on this evidence, which phylum would this new animal likely be classified into?
A. Arthropoda
B. Echinodermata
C. Nematoda
D. Mollusca

Answer 1

The organism that has a bilaterally symmetric unsegmented body and is  capable of moving on its own with a muscular appendage  which is  encased in a large shell that seems to be attached to its body belongs to the phylum Mollusca.

Answer: Option D

Explanation:

The organisms that are present in the earth are majorly divided into 2 kingdoms that is the plant kingdom and the animal kingdom. The animal kingdom is divided into groups called as phylum depending upon its morphological and behavioral characteristics.

Answer 2

The correct answer would be D. Mollusca.

The question is basically describing a snail.

Arthropoda have segmented bodies.

Echinodermata(starfishes, sand dollars etc.) are radially symmetrical.

Also none of them have shells except phylum Mollusca :)