It seems there are fewer dinosaur species as dinosaur change in appearance at each stage of life. Also DNA is like a biological ladder diagram in an electrical circuit where motors are turned on and off or in certain sequences to perform the process. The DNA unlike a ladder diagram contains all the code from it earliest existence i.e. it is an evolutionary trail. Some genes like motors or activator in a circuit are turned on or off to fulfill their genetic role of a specie. Epigenetics explains how genes are turned on and turned off. It is the biological equivalent of the instruction manual of a ladder diagram.
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