Answer is the phylum is Pteridophyta. Pteridophytes are first land plants, examples ferns, <em>Lycopodium, Selaginella. </em>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.
<span>Populations of a short type of sunflower are identified as a new species under the conditions that </span>they are unable to breed with the sunflowers of the original population.
