In the later stages of the preoperational stage, children show an understanding that certain things stay the same, regardless of changes in shape, size, and appearance. This is called __________

The axons releasing ________ extend from the hypothalamus to the basal forebrain and many other areas, enhancing wakefulness

Fill in the blank(s) with the appropriate word(s).

If a color is completely saturated, then it contains only a single wavelength

Indicate whether this statement is true or false.