The cell is the basic unit of all life. All living things-- tigers, trees, elephants, and men-- are made up of cells. A cell is alive-- as alive as you are. It breathes, takes in food, and gets rid of waste. It grows and reproduces, or creates one of its own kind. (Garrod 36) Most cells reproduce by dividing, so that there are two cells where there once was one. (Akkas 78) Every living thing is made up of one or more cells, and each of these cells was produced by an already existing cell.
New cells are formed by dividing, so that there are two cells were there once was one. One-celled plants and animals begin and complete their lives as single cells. (Kemp 12) Human beings and multicellular plants and animals also develop from a single cell. But after this cell grows to a certain size, it divides and forms two cells.
These two cells grow and divide, forming four cells. (Zeuthen 49) The cells grow and divide over and over again, and during this process they begin to specialize. A rabbit, an elephant, an oak, or a human being finally develops from a single cell. There are two main types of cell division: (1) mitosis and (2) meiosis. (Balls 34) Most cells are produced by a process called mitosis. In mitosis, a cell divides and forms two identical daughter cells. (Prescott 102) Each daughter cell then doubles in size and becomes capable of dividing. Most one-celled plants and animals reproduce by mitosis. (Baserga Biology 56) This is also the way most cells in your body and multi-cellular plants and animals reproduce.
Mitosis in animal cells takes place in four orderly stages-- (1) prophase, (2) metaphase, (3) anaphase, and (4) telophase. (Moore 91) Most of the activity occurs...