Diagrams, tables, and graphs are used by scientists mainly to
A.
design a research plan for an experiment
B.
test a hypothesis
C.
organize data
D.
predict the independent variable

The answer C because scientists use graphs. tables to organize and write down their data

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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answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times