The cubic kilometer is a metric unit of volume equal to 1,000,000,000 cubic meters. The symbol of the cubic kilometer is kmÂ³ . km3 = 1,000,000,000 m3 = 109 m3. To convert cubic kilometers to hmÂ³, damÂ³, mÂ³, dmÂ³, cmÂ³ and mmÂ³ , multiply by one followed by as many trios of zeros as there are places between the cubic kilometer and the other unit.
Rod photoreceptors are very sensitive to light and are responsible for night vision. These are the most abundant cell type in the human retina and are located closest to the back of the eye, near the retinal pigmented epithelium (RPE).
Special cells called Rods and Cones are used to process light, in a human eye, their number is estimated to be 5-7 million Cones and 110-130 million Rods. Cones are found mainly in the central area of the Retina (Fovea), while Rods are found in the Peripheral Retina. The Photoreceptors respond to light, it causes the activation and consequent breakdown of a photo-sensitive pigment, bound in large quantities to the membranes of the outer segment.