““Once an egg has been fertilized and managed to attach itself to the wall of the uterus and gastrulates (produces the three layers), the next key stage is the development of the “blastocyst,” the sack or sphere of just one hundred fifty cells that is produced by the first few divisions of the single cell that is the fertilized ovum. These cells will divide and divide to become a porpoise, a possum, or a person.””
