Sawyer-Pedraza, Akiva

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Across
  1. 2. A sensory organ in aquatic vertebrates, especially fish, that detects water movement and vibrations.
  2. 3. One or more fins located on the back of a fish, used for stability and preventing rolling.
  3. 6. Small, tooth-like scales found on the skin of cartilaginous fishes (sharks and rays), which reduce turbulence and aid in locomotion.
  4. 9. The chamber of the heart that pumps blood out to the rest of the body.
  5. 12. A bony flap that covers and protects the gills of most bony fishes.
  6. 13. Marine invertebrates that are also chordates.
  7. 16. An ancient group of jawless fish characterized by their cartilaginous skeleton and a sucking mouth.
  8. 18. An organism that relies on external sources of heat to regulate its body temperature.
  9. 19. Another group of jawless fish, closely related to lampreys, known for their slimy secretions and eel-like bodies.
  10. 20. A flexible rod that supports the body in chordates.
Down
  1. 1. Paired fins located on each side of a fish, typically behind the gill covers, used for steering, braking, and sometimes for locomotion.
  2. 4. An internal gas-filled organ that helps many bony fish control their buoyancy.
  3. 5. A diverse group of bony fishes characterized by fins supported by bony rays. This is the largest class of vertebrates.
  4. 7. A type of cartilaginous fish belonging to the order Rajiformes, characterized by a flattened body and wing-like pectoral fins.
  5. 8. In the circulatory system, the atrium is a chamber that receives blood.
  6. 10. fin The tail fin of a fish, used for propulsion.
  7. 11. A group of bony fishes characterized by fleshy, lobed fins, which are thought to be ancestral to tetrapods (land vertebrates).
  8. 14. A small, translucent marine animal that is a primitive chordate.
  9. 15. A single posterior opening that serves as the urinary, defecatory, and reproductive tract in many vertebrates, including fish, amphibians, reptiles, and birds.
  10. 17. Another type of cartilaginous fish, also belonging to the order Rajiformes, often confused with skates but generally having a more distinct tail and often venomous barbs.