chapter 3 lesson 3 Flashcards
Invertebrate
An animal that does not have a backbone.
Cnidarian
An invertebrate animal that includes jellyfish, corals, and hydras.
Radial symmetry
An arrangement of body parts that resembles the arrangement of spokes on a wheel.
Tentacle
An armlike body part in invertebrates that is used for capturing prey.
Flatworm
A simple worm that is flat and thin.
Bilateral symmetry
A body plan that consists of left and right halves that are the same.
Roundworm
A worm with a smooth, round body and pointed ends.
Segmented worm
A worm whose body is divided into sections, such as earthworms or leeches.
Mollusk
An invertebrate divided into three parts.
Arthropod
A member of the largest group of invertebrates, which includes insects.
Molting
The process by which an arthropod sheds its external skeleton.
Crustacean
A class of arthropods that includes crabs, lobsters, crayfish, and sow bugs.
Arachnid
A class of arthropods that includes spiders, scorpions, mites, and ticks.
Complete metamorphosis
Changes in form during development in which earlier stages do not look like the adult.
Incomplete metamorphosis
Changes in form during development in which earlier stages look like the adults.
