There are lots of tools hidden behind other tools in Illustrators. This makes it easy to totally forget where some of them are. To quickly refresh your memory, Option-Click (Alt on PC) on any tool in the palette, with a small arrow to its lower right, to reveal the next hidden tool down with each click. Or you can click on any of these tools, and hold down your mouse until all tools hidden under it are revealed in a pop up.

Tip provided by Jeff Witchel, Certified Adobe® Training Provider.