Which of the following is not a major difference between "bryophytes" and all other plant phyla? a) seedless (bryophytes) vs. seed condition (all others) b) absence (bryophytes) vs. presence (all others) of xylem and phloem c) absence (bryophytes) vs. presence (all others) of differentiated body plan (true roots, stems and leaves) d) haploid (bryophytes) vs. diploid (all others) condition of the conspicuous life e) stage absence (bryophytes) vs. presence (all others) of lignin.