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)
Confidence votes 5.8K. There are to types of cells that act as photoreceptors in the eye. The Rod and Cones. Rods detect only the presence or absence of light withough distinguishing between colours thus giving black nad white vision (as at night).here are two types of cells that act as photoreceptors in the eye: ro â¦ ds and cones. Rods detect only the presence or absence of light without distinguishing between colors, thus giving black and white vision (as at night).