What type of seeds do samaras contain?

Samaras are a specific type of fruit that feature a distinctive wing or flattened extension which aids in the dispersal of the seeds they contain. This winged structure allows the seeds to be carried away by the wind when they fall from the parent tree, enhancing their ability to spread over a wider area for germination. This adaptation is particularly advantageous for species that grow in environments where competition for resources is high, as it allows for greater colonization of new areas.

The other options describe seed types that do not accurately represent the characteristics of samaras. Hard-shelled seeds and nut-like seeds refer to seeds encased in a tough outer layer, but samaras do not share this feature. Similarly, soft seeds typically refer to less durable seeds that may not have the same wind dispersal capabilities as those found in samaras. Thus, the unique wing structure of samaras is what defines them as containing winged seeds.