Leeches are annelids. Therefore, they are not members of the phylum Mollusca.

A. leeches

Annelids are worms that have visible segmentation in their bodies.

D. annelids

Roundworms are worms that have unsegmented bodies. A single tapeworm has many body segments called proglottids. Therefore, tapeworms are not roundworms.

D. tapeworms

Annelids have a true coelom, which is a fluid-filled cavity that lies between the body tissues.

A. coelom

Since pot B contained the independent variable, which is the earthworm, pot A serves as the control.

D. Pot A is the control.

Flatworms, which are members of the phylum Platyhelminthes, have developed three embryonic germ layers.

C. Platyhelminthes

A planarian has flame cells that help get rid of excess water and metabolic wastes from its body.

B. flame cells

The presence of cephalization and bilateral symmetry are characteristics of a flatworm. Flatworms do not have segmented bodies. Annelids are worms that have visible segmentation in their bodies.

C. I and II only

Gastropods, bivalves, and cephalopods are members of the phylum Mollusca.

E. Mollusks

Annelids are worms that have visible segmentation in their bodies. The body segments are separated by internal walls, or septae.

C. Annelids

Mollusks may either have an internal or an external shell.

E. Mollusks

Pseudocoelom is a body cavity that lies between the endoderm and mesoderm tissues of a roundworm.

B. Roundworms

Flatworms often exhibit asexual reproduction through fission. In fission, the worm splits into two and each half grows new parts and eventually matures into an adult worm.

A. fission

The two eyespots found in a flatworm are able to detect light in the environment.

B. light