Why were europeans less vulnerable to most diseases than native americans?
a)
they had built up immunities.
b)
they never came into contact with them.
c)
native americans were less hygienic than europeans.
d)
native americans did not practice medicine like europeans.

the correct answer that would best complete the given statement above would be option b. expanding civil services. diocletian and constantine paved the way for foreign invasion by dividing the empire, creating administrative bureaucracies and reorganizing the military, except for expanding civil services. hope this answer .

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