Question

select the correct answer from each drop - down menu.
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
body structure, but their breathing structures evolved from different ancestors
both body structure and breathing structures
breathing structures, but their body structure evolved from different ancestors
he may indicate that whales will have lungs in the future

Explanation:

Sharks (fish), whales, and dolphins (mammals) share a streamlined body shape due to convergent evolution (adapting to aquatic life), meaning this trait evolved independently, not from a common ancestor. However, their respiratory structures (gills for sharks, lungs for cetaceans) reflect their true evolutionary lineages: sharks are fish, while whales/dolphins are mammals, so these structures come from distinct ancestral traits. The shared body structure points to a common ancestor with a basic body plan adapted to movement, while the differing breathing structures evolved separately.

Answer:

body structure, but their breathing structures evolved from different ancestors