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).
Bottom, The chronological order of generation of mammalian retinal cell types. Retinal ganglion and horizontal cells are generated first, followed, in overlapping phases, by cone-photoreceptors, amacrine cells, rod-photoreceptors, bipolar cells and, finally, Muller glia cells. The numbers relate to embryonic and postnatal days of murine development.