Study 04 Animal Biology and Diversity with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
What is cephalization, and how is it associated with bilateral symmetry?
Bilateral symmetry divides the body into left and right halves. It is associated with a front end, where sensory structures and nervous tissue are often concentrated—a pattern called cephalization.
What is one function of a coelom?
A coelom is a fluid-filled body cavity that provides room for organs and can help cushion them.
How do sponges obtain food from flowing water?
Water flows through their pores and chambers, bringing food and oxygen close to their cells. Collar cells capture food from the water.
What do cnidarians use their stinging cells for?
Cnidarians use specialized stinging cells to capture prey or defend themselves.
How does a flatworm's body plan support exchange across its surface?
Flatworms have no coelom. Their flattened, thin bodies allow exchange across the body surface.
What body-cavity and digestive features distinguish roundworms?
Roundworms have a body cavity that is not completely lined by mesoderm and a complete digestive tract.
Which mollusk group lacks a radula?
Many mollusks have a rasping radula, but clams do not.
Why must arthropods molt as they grow?
Their chitin-based exoskeleton must be shed for growth, so arthropods molt.
How do sea stars use tube feet?
Sea stars use tube feet, powered by a water-vascular system, to move and handle food.
What five features occur in chordates at some point in development?
At some point in development, chordates have a notochord, a dorsal hollow nerve cord, pharyngeal slits or arches, a post-anal tail, and an endostyle or related structure.
What features distinguish vertebrates?
Vertebrates are chordates with a backbone and a cranium that protects the brain.
What role does a swim bladder play in many bony fishes?
A swim bladder helps many bony fishes control their buoyancy.