An element has three naturally occurring isotopes. use the information below to calculate the weighted average atomic mass of the element, showing both the setup and the final answer for the calculation. isotope atomic mass percent abundance a 15.99 u 99.762% b 16.99 u 0.038% c 17.99 u 0.200%

Average mass=A x %of A + B x % of B + C x % of C; 
remeber 1% = 0.01 
= 15.99*.

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

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