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.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.