* What did the Aztec civilization have that the Mayan civilization lacked?
Impressive Architecture
A calendar system
A single controlling authority

What were the main features of the aristotelian-ptolemaic model of the cosmos

Which fundamental right is protected in this excerpt ?

What event started the space race and made americans feel their security was threatened a.) alan shepard's suborbital flight. b.) the launch of sputnik c.) the launch of explorer d.) the cuban missle crisis