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Final answer:
The answer explains the differences between vertebrates and invertebrates, characteristics of vertebrate classes, breathing organs of various animals, and the external structures of a fish and a bird.
Explanation:
Vertebrates vs. Invertebrates: Vertebrates have a vertebral column, while invertebrates lack a backbone. Vertebrates include mammals, birds, reptiles, amphibians, and fish, whereas invertebrates encompass various phyla such as Arthropoda and Mollusca.
Main characteristics of vertebrates:
- Fish: Cartilaginous fish have a skeleton made of cartilage, such as sharks. Ray-finned fish have bony rays in their fins, like trout.
- Amphibians: They have moist skin for respiration, like frogs, and undergo metamorphosis.
Breathing organs:
- Mammals: Lungs
- Reptiles: Lungs
- Aves: Air sacs and lungs
- Pisces: Gills
External structures of a fish: Examples are gills and fins. External structures of a bird: For instance, wings, beak, and feathers.
Learn more about Vertebrates, Invertebrates, Comparative Anatomy here:
https://brainly.com/question/37145434
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