Final answer:
Seed plants do not possess rhizoids; they have developed true roots, leaves, and a complex vascular system instead.
Step-by-step explanation:
Seed plants have all of the following EXCEPT rhizoids. While nonvascular plants, such as bryophytes, lack vascular tissue and therefore do not have true roots, stems, or leaves and may rely on rhizoids for anchorage and water absorption, seed plants have developed true roots, leaves, and a complex vascular system. This system includes xylem and phloem tissues that transport water, nutrients, and food throughout the plant, allowing them to achieve greater sizes and complex structures. The presence of vascular tissue also led to the development of true leaves, which capture sunlight and perform photosynthesis more effectively than their nonvascular counterparts.