The absolute refractory period of an action potential

A) only ensures one-way travel down an axon.
B) only allows a neuron to ignore a second signal sent that closely follows the first.
C) only prevents summation of action potentials.
D) ensures one-way travel down an axon and allows a neuron to ignore a second signal sent that closely follows the first.
E) ensures one-way travel down an axon, allows a neuron to ignore a second signal sent that closely follows the first, and prevents summation of action potentials.

c. taught scientists many new things about the earth, but not other planets.

explanation:

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.

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answer; the region experienced a surplus of food;