Across
- 4. a transient organ formed by the intimate apposition or fusion of fetal (embryonic) membranes and maternal (or paternal) tissues, functioning primarily for physiological exchange.
- 5. an organism that generates its own body heat internally through high metabolic activity rather than relying on the surrounding water temperature.
- 7. an animal that lacks a backbone or spinal column, comprising over 90% of all animal species
- 10. the free-swimming, umbrella- or bell-shaped gelatinous life stage of cnidarians, commonly known as jellyfish
- 13. a flexible, internal organ located in the dorsal body cavity of most bony fish, filled with oxygen, nitrogen, and carbon dioxide.
- 14. a specialized, shelled reproductive structure containing specialized membranes—the amnion, chorion, and allantois—that protect and hydrate the embryo.
- 15. an animal belonging to the subphylum Vertebrata (phylum Chordata) characterized by possessing a backbone or spinal column that protects the spinal cord, along with an internal skeleton (endoskeleton) and a skull.
- 16. animals that rely primarily on external environmental heat sources (the water) to regulate their body temperature
- 18. an internal structural framework—composed of bone, cartilage, or mineralized plates—located inside the body, covered by soft tissues.
- 20. where organisms, primarily crustaceans like crabs, lobsters, and shrimps, shed their rigid exoskeleton to allow for growth and development
- 21. the lack of equivalence, equivalence, or balance between two or more parts, where sides do not mirror each other
Down
- 1. an abnormal growth of tissue that protrudes from a mucous membrane, commonly found in the colon, stomach, uterus, nose, or vocal cords
- 2. a unique, hydraulic network of fluid-filled canals and tube feet exclusive to echinoderms
- 3. an organism, such as a plant or invertebrate animal, that possesses both male and female reproductive organs, allowing it to produce both eggs and sperm
- 6. a strong, flexible, and resilient connective tissue that serves as a vital structural component in animals, providing support, protecting joints, and reducing friction between bones.
- 8. the arrangement of body parts around a central axis, where the organism or object can be divided into similar halves by multiple planes passing through the center.
- 9. a form of asexual reproduction where a new organism develops as an outgrowth (bud) from a parent, eventually separating into a new individual
- 11. a rigid, protective external skeleton, often composed of chitin or calcium carbonate, that supports, protects, and enables movement for invertebrates like crabs, lobsters, and mollusks.
- 12. where an animal can be divided into identical left and right mirror images along a single, central plane, usually from head to tail.
- 17. the ecological region at the lowest level of a body of water, including the sediment surface and sub-surface layers.
- 19. specialized, milk-producing organs found in female marine mammals (cetaceans, pinnipeds, sirenians) used to nourish their young.