Cameron Marlin
Ms. Terrell
Pre-AP English 11
16 April 2010
In the book, The Evolution of Man, Volume 1, by Ernst Haeckel, Haeckel talks about the Gastraea Theory in chapter 1.8. Haeckel says that “The agreement of the animal world in the first changes after impregnation of the Ovum, and the formation of the stem cell begin in all cases of segmentation of the Ovum and formation of the germinal layers.” (102). The protozo is the only exception, it is the smallest and simplest form of animal life. This is the only group that cannot form germinal layers or stem cells. Then the stem cell that proceeds from the impregnated ovum always passes by the repeated cleavage into a bunch of single cells.
In my opinion, Gastraea’s theory about the impregnated female egg going through the segmentation process is true. This theory explains that to make more species of the animal life you have to have Gastraea’s theorem. For example, Gastraea’s Theorem says that to make species you have to impregnate, go through segmentation and then have the baby. This is true for all living things, the female has to be impregnated to have any offspring’s. The ovum goes through the body to make many single cells, and I strongly agree with his theory.
Haeckle, Ernst. Evolution of Man, Volume 1. 1. Human Embryology, 102-118. Print.
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