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Design a dichotomous key to divide vertebrates into classes. Provide one example of a species for each class named in your key.

Start with the question: "Is the animal warm-blooded?"

Answer :

Final answer:

A dichotomous key is a tool used by scientists to identify and classify organisms based on their characteristics. To divide vertebrates into classes, we can start with the question, 'Is the animal warm-blooded?' If the answer is yes, the animal belongs to the class of mammals. An example species of mammals is the human (Homo sapiens). If the answer is no, we move to the next question. The next question could be, 'Does the animal have feathers?' If the answer is yes, the animal belongs to the class of birds. An example species of birds is the robin (Turdus migratorius). If the answer is no, we move to the next question. The next question could be, 'Does the animal have scales?' If the answer is yes, the animal belongs to the class of reptiles. An example species of reptiles is the green iguana (Iguana iguana). If the answer is no, we move to the next question. The next question could be, 'Does the animal have moist skin?' If the answer is yes, the animal belongs to the class of amphibians. An example species of amphibians is the red-eyed tree frog (Agalychnis callidryas). If the answer is no, we move to the final question. The final question could be, 'Does the animal have gills?' If the answer is yes, the animal belongs to the class of fish. An example species of fish is the goldfish (Carassius auratus).

Explanation:

To design a dichotomous key to divide vertebrates into classes, we can start with the question, 'Is the animal warm-blooded?'

  1. If the answer is yes, the animal belongs to the class of mammals. Mammals are warm-blooded animals that have hair or fur, produce milk for their young, and give birth to live young. An example species of mammals is the human (Homo sapiens).
  2. If the answer is no, we move to the next question.
  3. The next question could be, 'Does the animal have feathers?'
  4. If the answer is yes, the animal belongs to the class of birds. Birds are warm-blooded animals that have feathers, lay hard-shelled eggs, and have beaks. An example species of birds is the robin (Turdus migratorius).
  5. If the answer is no, we move to the next question.
  6. The next question could be, 'Does the animal have scales?'
  7. If the answer is yes, the animal belongs to the class of reptiles. Reptiles are cold-blooded animals that have scales, lay soft-shelled eggs, and have lungs. An example species of reptiles is the green iguana (Iguana iguana).
  8. If the answer is no, we move to the next question.
  9. The next question could be, 'Does the animal have moist skin?'
  10. If the answer is yes, the animal belongs to the class of amphibians. Amphibians are cold-blooded animals that have moist skin, lay jelly-like eggs, and undergo metamorphosis. An example species of amphibians is the red-eyed tree frog (Agalychnis callidryas).
  11. If the answer is no, we move to the next question.
  12. The final question could be, 'Does the animal have gills?'
  13. If the answer is yes, the animal belongs to the class of fish. Fish are cold-blooded animals that have gills, lay eggs, and live in water. An example species of fish is the goldfish (Carassius auratus).

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