You drive a nail into a tree that is 10 feet tall,and come back 10 years later.The tree is now 30 feet tall,but the nail is the same distance from the ground.This is because the tree grows up from
A) the apical meristem only.
B) the lateral meristem only.
C) both the lateral and apical meristems.
D) the soil line.
E) the node.