Which of the layers shown in the diagram below of a tree trunk were most recently produced by the vascular cambium? 
Definitions:
Blending
The cognitive process of combining two or more distinct entities or ideas into a new, unified concept.
Trichromatic Color Mixing
A theory of color vision that proposes the eye has three types of receptors, each sensitive to red, green, or blue light, and that all colors are perceived through the combination of these receptors' activities.
Opponent-process Theory
A psychological and neurological model that explains how the perception of one color can affect the perception of another, leading to contrasting aftereffects.
Trichromatic
A theory of color vision that proposes the eye detects colors through the response levels of three types of cones sensitive to different wavelengths.
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