Which type of reaction is used to break down atp into adp and pi?

Which list shows the levels of organization of an organism in hierarchical order from left to right, from the smallest to the most complex?

How does the nervous system affect the excretory system?

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?