Answer:
The Ancient Mayans developed the science of astronomy, calendar systems, and hieroglyphic writin.
Explanation:
They were also known for creating elaborate ceremonial architecture, such as pyramids, temples, palaces, and observatories. These structures were all built without metal tools. The Maya were skilled weavers and potters.
Answer:
observer effects.
Explanation:
Observer effects refer to a form of reaction due to the cognitive bias of a researcher causes an unconscious influence on the participants involved in the research. In other words, the observers see a behavior and interpret it according to what it means to them, while not considering the context in which the participant behaved that way.
The Awnser Is C Because Thats How They Get stuff through trade.