For the first 12 hours after conception, the fertilized egg remains a single cell. ... During the first 8 or 9 days after conception, the cells that will eventually form the embryo continue to divide
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In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. ... On the other hand, an exothermic reaction releases energy into the surrounding of the system. A chemical reaction that releases energy, usually in the form of heat. What's the main difference between an exothermic and endothermic reaction? An exothermic reaction releases energy and feels warm while an endothermic reaction absorbs energy and feels cool.
Considered to be homologous structured similarities, they are different due to evolution and how they were used over thousands of years, eventhough they are all similar because of a common ancestor.