What was an achievement of the aztecs?

a. utilizing a well-devolved writing system
b. developing the numeral zero
c. the use of an aqueduct
d. developing the first calendar

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Around the third week of a college class, a professor decides she’s had enough, is tired of dealing with bureaucracies, and wants out. so one day, instead of coming to class, she flies to tahiti and sells souvenirs on the beach. if this happened, the college would simply assign a substitute to finish the course. what does this tell you about the nature of the authority wielded by a professor?

Radiation was first detected by a ?

Which products do you think required scientific knowledge to develop?