Textbook Question
A marine biologist has dredged up an unknown animal from the seafloor. Describe some of the characteristics that could be used to determine the animal phylum to which the creature should be assigned.
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32. Vertebrates
Chordates
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Which of the following is classified as a tetrapod?
A
Frog
B
Shark
C
Octopus
D
Salmon
Verified step by step guidance1
Understand the definition of a tetrapod: Tetrapods are vertebrates that have four limbs or limb-like appendages. This group includes amphibians, reptiles, birds, and mammals.
Identify the characteristics of each option: A frog is an amphibian with four limbs, a shark is a cartilaginous fish without limbs, an octopus is a mollusk with tentacles, and a salmon is a bony fish without limbs.
Determine which of the options fits the definition of a tetrapod: Since tetrapods have four limbs, we need to identify which of the options has this characteristic.
Analyze the options: Frogs have four limbs and are classified as amphibians, which are part of the tetrapod group. Sharks, octopuses, and salmon do not have four limbs and are not classified as tetrapods.
Conclude that the frog is the correct answer as it fits the definition of a tetrapod, having four limbs and being an amphibian.
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