Question

what is a key feature of nonvascular plants?
they have woody stems and grow very tall.
they have large seeds that form inside cones.
they lack special tubes called xylem and phloem.

Explanation:

Nonvascular plants lack vascular tissues (xylem and phloem). Xylem transports water and minerals, phloem transports nutrients. Without these, they can't grow tall (contradicts first option). They reproduce via spores, not seeds (eliminates second option).

Answer:

They lack special tubes called xylem and phloem.