Marilyn was asked to solve a series of five math problems. the first four problems could only be solved by a particular sequence of operations. the fifth problem could also be solved following this sequence; however, a much simpler solution was possible. marilyn did not realize this simpler solution and solved the problem in the way she had solved the first four. her problem-solving strategy was hampered by:
a. functional fixedness
b. the overconfidence phenomenon
c. mental set
d. her lack of a prototype for the solution

They are correct!

Explanation: C) Mental Set

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the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.