Answer:
I suppose it would be the seed.
Vestigial structures are taken as an example of evolution because they give us an indication of structures that, due to the adaptation to the environment, disappeared.
At the end of the vertebral column, we have the coccyx as an example of this. Its believed that it could have formed a tail and currently, is only a small bone without any specific function, even some individuals are born without it.
Explanation:
B has water as a reactant
Pioneer species are often hardy plants with Adaptations such as long roots, root nodes containing nitrogen-fixing bacteria, and leaves that employ transpiration.
