Arthropods
What is the hard outer covering of arthropods called?
Exoskeleton
What stinging cells do cnidarians use to catch prey?
Nematocysts
What does "Annelida" mean?
"Little rings" or Segmented body
What is the main function of the pores in a sponge’s body?
To let water in for filter feeding
What is the soft body part that makes the shell in mollusks?
The Mantle
Arthropods have jointed what?
Appendages
What is the name of the jelly-like middle layer between a cnidarian’s tissues?
Meso layer
What symmetry to annelids have?
Bilateral Symmetry
What are sponges made of that gives them structure — spongin or spicules?
Both — spongin for flexibility, spicules for support
What structure do many mollucks use to scrape food?
The Radula
Name one reason arthropods molt
To grow — their exoskeleton doesn’t stretch - they must shed it
Name the two main body forms of cnidarians.
Polyp and Medusa
How is an annelid different from Platy worms
Platys are flat
Sponges are sessile. What does sessile mean?
They do not move; they stay attached to one place
Name one example each of a gastropod, bivalve, and cephalopod
Example: snail, clam, octopus
What are the three main body sections of an insect?
Head, thorax, abdomen
How do cnidarians get food?
They sting and paralyze prey, then pull it into their mouth
Annelids are typically not parasitic, what type of worm is?
flatworms - tapeworm or fluke
How do sponges reproduce asexually?
By budding or regeneration
Cephalopods
Name at least two classes in this phylum
Insects, Arachnids, Crustacea, Myriapods (millipeds), Trilobita
Give one example of a colonial cnidarian
Coral or Portuguese Man-o-War
Where do most annelids live?
in soil or water
Why are sponges considered the simplest animals?
They lack true tissues and organs
What is the main function of the muscular food in mollusks?
Movement, digging, or burrowing