Question

how many derived shared traits do the frog and the mane wolf have in common?
2
4
3
1
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Explanation:

Frogs (amphibians) and maned wolves (mammals) are both tetrapods, sharing the derived trait of having four limbs (a key shared derived character of tetrapods). They also share other derived traits like having a vertebral column (vertebrate), but in typical cladistic contexts for such questions, the core shared derived traits are: 1. Tetrapody (four limbs), 2. Amniotic eggs (frogs are anamniotic, correction: wait, no—frogs are amphibians, so they are anamniotic; maned wolves are amniotic. The correct shared derived traits are: having a cranium with a backbone (vertebrate), paired appendages, and tetrapod limbs? No, wait, the correct count here is 2: vertebral column (vertebrate) and tetrapod (four limbs). Wait, no, let's clarify: The shared derived traits between amphibians and mammals are: 1. Tetrapody (four limbs, derived from lobe-finned fish), 2. Vertebral column with a well-defined head (craniate vertebrate). Wait, no, actually, the standard answer for this common question is 2 shared derived traits.

Answer:

2