After an RNA molecule is transcribed from a eukaryotic gene, portions called are removed and the remaining are spliced together to produce an mRNA molecule with a continuous coding sequence.

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?