Across
- 4. process by which an animal casts off parts of its body to serve some beneficial purpose
- 5. free-swimming, bell-shaped adult stage of cnidarians
- 8. animals that neither develop nor retain a vertebral column
- 10. the ecological region at the lowest level of a body of water
- 12. a strong, flexible, and avascular connective tissue found throughout the body, including joints
- 14. a wearable robotic or mechanical frame that enhances, supports, or restores human physical capabilities
- 16. a body plan where an organism can be divided into identical left and right mirror-image halves along a single central axis
- 17. animals with a vertebral column and a cranium
- 18. an abnormal cluster of cells forming a growth
- 19. an organism possessing both male and female reproductive organs
Down
- 1. the arrangement of body parts around a central axis
- 2. an internal, gas-filled organ in bony fish that regulates buoyancy
- 3. a form of asexual reproduction
- 4. specialized, sweat-derived organs found in mammals that produce milk
- 6. unique, hydraulic network of fluid-filled canals and tube feet found in echinoderms
- 7. specialized, self-contained eggs that evolved around 340 million years ago
- 9. an internal structural framework
- 11. the lack of balanced proportions
- 13. a chemical reaction or physical change that absorbs heat from its surroundings
- 15. animals, such as reptiles, amphibians, and fish, that rely on external environmental heat sources