what three major advances are obvious among the vascular plants with seeds?

The last common ancestor of land plants was probably a leafless axial ... Since then, dramatic advances in phylogenetic analysis, molecular genetics, ... 1997a, b) distinguished three basic types of vascular cells: cells with uniform ... et al., 1998b) is rather an obvious sign of complete nutritional autonomy.

The major divisions of plants will be considered in relation to their ability to ... Opinion differs among scientists as to the rate of biological evolution. ... . The three eras mentioned above are divided into 12 geologic periods, and ... .. The evolution of the seed is considered to be one of the most significant advances of the land ...

No obvious eyes or lateral fins. ... Two major groups of vertebrates: ... .. The oldest unquestioned vascular plant fossils occur in Silurian rocks. ... Three majoradvances in land plant history, developing more efficient reproductive ... Seeds appeared in the Late Devonian, although it is not known which plant produced them.

These advances toward a more complete understanding of vascular plant relationships have ... among the major lineages of vascular plants (based on Pryer et al., 2001a⇓). ... Spermatophytes are united by the presence of seeds ( megasporangia ... . Our sampling included three lycophytes (outgroup), each representing a ...