How does the stomach protect itself from being digested by its own gastric juices? a]it secretes mucin that coats the lining
b]the pancreas adds insulin to the stomach
c]it squeezes gastric juices only in the middle
d]the liver sends bile to the stomach

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?