Vascular cambium is one of two lateral meristems; the other is cork cambium. a plant grows in diameter primarily through divisions of the vascular cambium. if you pull a small piece of bark off a tree and look at the bark's inside surface, what tissue are you looking at? ignore any remaining cells of vascular cambium that may be left.

a. xylem
b. phloem

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.