What feature characterizes tracheophytes?

Tracheophytes, also known as vascular plants, are characterized by the presence of specialized transport systems, specifically xylem and phloem. Xylem is responsible for the conduction of water and dissolved minerals from the roots to the rest of the plant, while phloem transports the products of photosynthesis, mainly sugars, throughout the plant. This vascular system allows tracheophytes to grow larger and inhabit a wider range of environments compared to non-vascular plants.

Tracheophytes also typically have true roots, stems, and leaves, which aids in their growth and reproduction. This complex structure is critical for the plant's ability to thrive on land and is a significant evolutionary advancement that sets tracheophytes apart from other plant groups.

In contrast, options related to digestive systems, cellular organization, and symmetry do not pertain to the characteristics defining tracheophytes. They are distinct features found in different groups, highlighting the unique aspects of plant biology and ecology.