Final answer:
Nonvascular plants (bryophytes) lack true roots, leaves, seeds, and have no vascular tissue, but they can have stalk-like structures, also known as stem-like structures.
Step-by-step explanation:
Nonvascular plants, also known as bryophytes, lack several features that are common in vascular plants, such as vascular tissue, true roots, stems, leaves, seeds, and flowers. Among the options given, nonvascular plants lack all of the following EXCEPT stalks. They might have stem-like structures despite not having true stems (which would be part of the vascular tissue system).
They also have rhizoids that serve to anchor them to the ground and absorb water and minerals, as opposed to true roots.