Me : ):
steady state theorists support the perfect cosmological principle, which suggests the universe looks the same from all directions, but over time.

The correct answer or fill in would be- but Change and evolve over time.

Explanation:

The perfect cosmological principle is a extended version of the cosmological principle. The perfect cosmological principle says that the universe is look same from all directions but can be change and evolve with time.

Steady state theory supports this theory as it also says that universe is expanding but also maintain its density even though it continuously creates stars and galaxies but still look same.

Thus, the correct answer is - but Change and evolve over time.

me two

explanation:

because i hate it

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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