Assuming that conditions ripe for life and intelligence abound in the galaxy, what

R

Radames G

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factor limits the number of? Assuming that conditions ripe for life and intelligence abound in the galaxy, what factor limits the number of Galactic civilizations?
a. The average survival time for civilizations.
b. The distance between civilizations.
c. The distance of civilization from the center of the Galaxy.
d. The development of electronics.
 
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