the dried excrement of fish-eating sea birds, deposited in rocky coastal regions of South America: contains the urates, oxalates, and phosphates of ammonium and calcium; used as a fertilizer.
In prokaryotes there is only one rather simple type of cell division, which produces two identical daughter cells from one progenitor cell. This is asexual cell division, since it involves no sexual union of different individuals.
Humans do produce haploid sperm and egg cells (with only one set of chromosomes for a total of 23 chromosomes per cell) during meiosis for reproduction as these two haploid cells can then fuse to produce a diploid fertilized embryo. However, not all haploid cells are sex cells for multicellular organisms. A haploid cell is a cell with only one set of chromosomes. For example, humans are diploid organisms-our cells each have two copies of 23 different chromosomes for a total of 46.