The separate lineages leading to dolphins and sharks both evolved streamlined bodies, dorsal fins, and broad tail fins as adaptations to efficient locomotion in a marine environment. in this comparison, the bodies and fins of dolphins and sharks are what type of structures?

Analogous

Explanation:

The bodies of sharks and dolphins are analogous structure. They have common functions but they are originated separately.

The analogous structures are those structures that originate differently and their  functions remains the same or the the differently originated structures functions in a similar way.

Example : body of dolphins and sharks.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.