Worms
Name one place worms can be found.
Soil, water, or inside other animals.
What is an invertebrate?
An animal with no backbone.
Name one echinoderm.
Sea stars, sea urchins, sea cucumbers, brittle stars, or feather stars.
What covers the soft body of a mollusk?
A mantle.
How many main body sections do insects have?
Three — head, thorax, abdomen.
What are the three main groups of worms?
flatworms, segmented worms, and roundworms.
Which group is more common in the ocean: invertebrates or vertebrates?
Invertebrates.
What are two shared characteristics of echinoderms?
Spiny skin and tube feet.
Name two animals in the mollusk phylum.
Snails, octopuses, squids, bivalves.
What major feature sets arachnids apart from insects?
Arachnids have two body sections and eight legs; insects have three body sections and six legs.
Where do parasitic worms live?
Inside other animals.
How do corals grow?
By budding from the parent polyp.
What structure helps echinoderms move?
Tube feet.
What is a bivalve?
A two-shelled filter-feeding mollusk that often stays buried.
Name one major characteristic of crustaceans.
They often have multiple pairs of legs and live in water (e.g., crabs, lobsters, shrimp).
What do earthworms do to the soil as they move?
They swallow soil, digest plant matter, and release nutrient-rich worm castings.MAKE NEW DIRT
How do corals and algae help each other?
Coral gives algae a home; algae make sugar through photosynthesis and share it with the coral.
Why do echinoderms have spiny skin?
For protection and support.
What makes octopuses and squids different from other mollusks?
They are large, intelligent, and can change the color of their mantles.
What structures do insects have on their head, and what are they used for?
Eyes, jaws, and feelers (antennae); used for sensing, feeding, and navigating.
How do most marine worms catch their prey?
The shoot out a probiscis
What is the purpose of a jellyfish’s tentacles?
To sting and paralyze prey.
Name one difference between worms and echinoderms.
Worms have long soft bodies; echinoderms have radial symmetry and spiny skin.
How do octopuses and squids move using jet propulsion?
They take water into the mantle and squeeze it out through small nozzles to move forward.
Describe the difference between the two insect life cycles (3-stage vs 4-stage).
4-stage: egg → larva → chrysalis → adult
3-stage: egg → nymph → adult