In which phylum do we see plants with lignin, vascular system but no seeds?

Answer is the phylum is Pteridophyta. Pteridophytes are first land plants, examples ferns, Lycopodium, Selaginella. Members have liginified cells and developed conducting tissues called vascular system to conduct water and synthesized food. They reproduce through spores, seeds do not develop in pteridophytes.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.