The answer I'm pretty sure would be dna
B is right
chufffggbbvggghhhhhhhhhhh
The answer is A, a mountain building.
The two faces of the book represent the tectonic plates
As he presses them towards each other he is modeling a convergent boundary, and mountains are an affect of convergent plates.
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Dendrite, axon, and cell body are the major parts of neurons. </span>
