Animal crossword

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Across
  1. 1. a chemical reaction or physical change that absorbs heat from its surroundings, resulting in a temperature drop in the surrounding environmen
  2. 3. a specialized, typically shelled egg produced by reptiles, birds, and monotreme mammals, featuring specialized membranes (amnion, chorion, yolk sac, allantois) that allow the embryo to breathe, manage waste, and stay hydrated, enabling reproduction on land
  3. 6. an organism, such as a plant or invertebrate animal, that possesses both male and female reproductive organs and can produce both eggs and sperm
  4. 8. a specialized, compound sebaceous gland found in female mammals that produces milk to nourish offspring
  5. 11. firm, whitish, flexible connective tissue found in various forms in the larynx and respiratory tract, in structures such as the external ear, and in the articulating surfaces of joints
  6. 12. organisms, habitats, or processes occurring at the lowest level of a body of water
  7. 14. (of an animal) shed old feathers, hair, or skin, or an old shell, to make way for a new growth.
  8. 17. a rigid external covering for the body in some invertebrate animals, especially arthropods, providing both support and protection.
  9. 18. the property of being divisible into symmetrical halves on either side of a unique plane
  10. 19. a gas-filled internal organ found in most bony fish that acts as a buoyancy control device, allowing them to remain at specific water depths without wasting energy swimming
  11. 20. (in an echinoderm) a network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.
Down
  1. 1. an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.
  2. 2. (of a plant) having or developing buds.
  3. 4. a free-swimming sexual form of a coelenterate such as a jellyfish
  4. 5. animals that rely on external environmental sources, such as sunlight or warm surfaces, to regulate their body temperature
  5. 7. a structural arrangement where body parts or components are arranged regularly around a central axis
  6. 9. animals belonging to the subphylum Vertebrata (within the phylum Chordata) characterized by possessing a backbone or spinal column, which protects the spinal cord
  7. 10. lack of equality or equivalence between parts or aspects of something; lack of symmetry.
  8. 13. an animal lacking a backbone, such as an arthropod, mollusk, annelid, coelenterate, etc
  9. 15. a solitary or colonial sedentary form of a coelenterate such as a sea anemone
  10. 16. a flattened circular organ in the uterus of pregnant eutherian mammals, nourishing and maintaining the fetus through the umbilical cord.