In the C and C++ programming languages, #pragma once is a non-standard but widely supported preprocessor directive designed to cause the current source file to be included only once in a single compilation.
During sexual reproduction, fertilization of the ovum (n, 23 chromosomes) by the sperm (n, 23 chromosomes) restores the diploid number and creates a zygote (2n, 46) (awww..) that divides and grows by mitosis to form a multicellular human.
exists and is an alternate of . Haploid, or gametic, human Cells have a chromosome number of n which is 23 individual chromosomes. The Gametic human sperm Cell has the chromosome number n = 23 [unpaired] chromosomes; in the also gametic human Oocyte (egg Cell), n also = 23.