Question

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sharks, whales, and dolphins share similar features such as body shape and the position of fins. however, sharks have gills for breathing, while whales and dolphins have lungs. these differences indicate that the organisms share a common ancestor for
both body structure and breathing structures
body structure, but their breathing structures evolved from different ancestors
both body structure, but their body structure evolved from different ancestors
may indicate that whales
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Explanation:

Sharks are fish (with gills for breathing), while whales and dolphins are mammals (with lungs for breathing). Similar body structures can evolve independently (convergent evolution) due to similar environmental pressures (e.g., living in water). Different breathing structures (gills vs. lungs) suggest different evolutionary lineages.

Answer:

body structure, but their breathing structures evolved from different ancestors