There are nine different essential oils in RC Blend. They are listed below along with a brief description of each oil. 1  Eucalyptus globulus Essential Oil - is one of many eucalyptus essential oils.  Eucalyptus radiata Essential Oil (Black Peppermint Oil) or Black Peppermint Oil is one of many eucalyptus essential oils.
Biology: We have cones! it is a part of our eye (on the retina, in the fovea). Cone cells, or cones, are one of the two types of photoreceptor cells that are in the retina of the eye which are responsible for color vision as well as eye color sensitivity (WIKIPEDIA)
Cones are the eye's receptor cells that are especially sensitive to ______ light and are responsible for our _______ vision. a. bright: black and white b. dim; color c. bright; color* d. drim; black and white.