General
Animals without a backbone
What are invertebrates?
An outer layer of cells designed for protection.
What is epithelium?
The sessile tubular form of a cnidarian with a mouth and tentacles.
What is the polyp?
The barrel-shaped swelling at segments 32-37 of an earthworm.
What is the clitellum.
The muscular organ that is used in locomotion.
What is the foot?
Animals with a backbone.
What are vertebrates?
The jelly-like substances that separates the outer and inner cell layers.
What is mesenchyme?
The free-swimming cnidarian with a bell-shaped body and tentacles.
What is the medusa?
The small bristles that help an earthworm move.
What are setae?
The organ covered with teeth that mollusks used for feeding.
What is the radula?
This type of symmetry is represented by two identical halves.
What is bi-lateral symmetry?
Flagellated cells that push water through a sponge.
What are collar cells (or choanocytes)?
What is mesoglea?
A circulatory system in which blood stays in vessels.
What is a closed circulatory system?
The sheath of tissue that encloses the vital organs of a mollusk.
What is the mantle?
The end of the animal that contains its tail.
What is the posterior end?
These hard structures are made of silica and support the sponge framework.
What are spicules?
Small capsules that contain a toxin that is injected into prey or predators.
What are nematocysts?
Masses of nerve cell bodies.
What are ganglia?
An organism with two shells.
What is a bivalve?
The concentration of sense organs and nerves in the head.
What is cephalization?
A cluster of sponge cells encased in a hard shell.
What is a gemmule?
Jellyfish reproduce sexually in this form.
What is the medusa form?
Possessing both male and female reproductive organs.
What is hermaphroditic?
The term cephalopod means this.
What is head-foot?