6th Grade Science : Observing Invertebrates 2.7-2.11

An earthworm's ______ are valuable because they enrich the soil.

• mantle

• castings

• paramecium

The part of the cell that directs the work of the cell is the _____.

• nucleus

• membrance

• amoeba

The leech, tapeworm, and roundworm are ____ worms.

• saprophytic

• paramecium

• parasitic

The shoe-shaped protozoan is the ____.

• paramecium

• amoeba

• cephalopod

The tissue that produces a mollusk's shell is called the ____.

• medusa

• mantle

• carapace

The projections of protoplasm that an amoeba pushes out are called ____, or "false feet."

• medusa

• nymph

• pseudopods

Mollusks with two matching shells joined by hinges are called ____.

• univalves

• bivalves

• rays

The octopus, squid, and nautilus all belong to the group of mollusks knows as ____.

• cephalopods

• parasites

• amphibians

The arms of sea star are called ____.

• medusas

• stingers

• rays

The jellyfish goes through these stages: larva, polyp, and ____.

• nymph

• medusa

• egg