Why should we use the subtractive techniques to make both the motor and sensory conduction velocity calculation

Thats bot a question

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem

A) the sequence of bases would halt the production of any proteins. 

Cell wall permeability changes and sodium rushes into the cell.