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.
ALL CELLS COME FROM PRE-EXISTING CELLS (however, sometimes one cell comes from two!). ASEXUAL REPRODUCTION: involves one parent; daughter cells are identical to the parent cell. SEXUAL REPRODUCTION: involves two parent cells; each parent gives some of its traits (characteristics) to the offspring. MITOSIS vs. MEIOSIS. MITOSIS: 1) growth and asexual reproduction; 2) occurs in all cells (my-toes-ees); 3) daughter cells are identical to parent (same # of chromosomes). MEIOSIS: 1) sexual reproduction; 2) occurs in sex cells (my-oh-sees); 3) daughter cells are different than parent 1/2 # of chromosomes).