Which of these is a type of low, flat land that is left behind after a large body of water, such as a lake, has completely disappeared? A. lacustrine plain
B. abyssal plain
C. lava plain
D. alluvial plain​

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?