- How many substances are known to exsist on earth?

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An action potential can be referred as a ¨wave of depolarization¨ down the axon. Explain what you think this means.? If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? Discrete Help ASAP. Please write out symbolic notation.? Diameter of a wheel 80cm. If the wheel rotates through an angle of 200degrees, how many cm does it move? Show steps please!? Name a class of annelids whose members may have protonephridia?