The rods are narrower than the cones and distributed differently across the retina, but the chemical process in each that supports phototransduction is similar. A third class of mammalian photoreceptor cell was discovered during the 1990s: the photosensitive ganglion cells.
Answer Wiki. It depends on a lot of things. CA is used for the national internet domain and as the abbreviation for the country in most database programs. CDN is used as Canada's code for automobiles - if a Canadian vehicle is driven in Europe temporarily, it needs a CDN sticker to show the license plate is Canadian.
The Canadian Dollar, which is the official currency of Canada, has the ISO 4217 Code of CAD. The corresponding ISO-4217 Code Number for CAD is 124. The CAD ISO code has a currency exponent of 2.