Which of the following statements is true regarding scientific hypotheses? A.
There are no valuable hypotheses.
B.
A testable hypothesis is valuable only if all evidence supports it.
C.
A testable hypothesis is valuable, even if evidence shows that it is false.
D.
Every hypothesis is valuable, whether or not it is testable.

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

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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