What did bhor's model of the atom include that ruthendorfs model did not have ?

If you are in a chronic state of anxiety but also suffer from moment of sudden, intense fear you are problably suffering. from

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?