Chapter 13
Cnidarians like jellyfish have this jelly-like substance between their two tissue layers, giving them a soft, gelatinous body.
What is mesoglea?
This muscular part of snails and other mollusks helps them move around.
What is the foot?
These tiny, shrimp-like creatures are found in plankton and are a crucial part of the ocean food chain.
What are copepods?
This unique system in starfish helps them move and eat.
What is the water vascular system?
These stinging structures inside the specialized cells of Cnidarians can shoot out like tiny harpoons to capture prey.
What are nematocysts?
Squids and octopuses have this type of blood system that helps them move fast.
What is a closed circulatory system?
This term refers to the hard outer shell that arthropods must shed in order to grow.
What is an exoskeleton?
Some starfish have tiny pincer-like tools on their skin for protection.
What are pedicellariae?
Cnidarians like jellyfish and sea anemones use these stinging cells for defense and catching prey.
What are cnidocytes?
Mollusks like clams and oysters use these to stay attached to rocks.
What are byssal threads?
Arthropods, like crabs and insects, have to do this because their hard shells don’t grow with them.
What is molting?
Starfish can do this amazing trick where they grow back lost arms. The term to self amputate is what?
What is autotomy?
Some species of Cnidarians, such as certain corals, have a partnership with tiny algae that live inside their tissues, providing them with nutrients. This type of behavior between organisms is called what?
What is a symbiotic relationship?
Squids use these to catch prey, and they have tiny teeth for gripping.
What are tentacles?
Many crustaceans, such as lobsters, have this kind of circulatory system, which is not enclosed in blood vessels.
What is an open circulatory system?
This type of sea creature has a five-part mouth structure called "Aristotle's lantern," which it uses to scrape food off surfaces.
What is a sea urchin?
Some jellyfish have a reproductive cycle that alternates between sexual and asexual forms, a process known as this.
What is alternation of generations?
Squids and cuttlefish have this inside their bodies to help them stay afloat.
What is the pen (squids) or cuttlebone (cuttlefish)?
Many marine arthropods, like crabs, are protected by a hard shell made primarily of this substance.
What is chitin?
Most echinoderms, like starfish and sea urchins, reproduce by releasing eggs and sperm into the water, a method known as this.
What is external fertilization?