The most specific assays for human chorionic gonadotropic (h…
Questions
The mоst specific аssаys fоr humаn chоrionic gonadotropic (hCG) use antibody reagents against which subunit of hCG?
Twо thоusаnd yeаrs аgо, the ancient Maya developed one of the most advanced civilizations in the Americas. The Maya developed a social hierarchy with a king at the top supported by a noble class of warriors, scribes, and priests. Most Mayan people were commoners, involved in agriculture and construction. The Maya were deeply religious, and worshiped various gods related to nature, including the gods of the sun, the moon, rain and corn. The Maya developed long distance trading networks with other Mesoamerican people. Stepped pyramids commanded city centers along with expansive royal palaces. The Maya developed a written language of hieroglyphs and invented the mathematical concept of zero. With their expertise in astronomy and mathematics, the Maya developed a complex and accurate calendar system. Mayan cities featured temple-pyramids, palaces, ball courts, and grand plazas. The region of the Yucatan Peninsula has no natural water sources -- no streams, lakes, rivers, or springs -- so the Maya had to use ingenuity to figure out how to sustain large populations in this environment. They became excellent managers of rainwater, using massive systems of cisterns to collect and store rainwater. All manner of theories have been presented as to what exactly had happened to the Maya cities, some more plausible than others. Disease, a social revolution, drought, famine, foreign invasion, over-population, disruption in trade routes, earthquakes, and even hurricanes were held responsible. The period prior to the Maya collapse is certainly characterised by extravagant building projects, unproductive wars, and over-exploitation of natural resources, especially land, forests, and water. Unfortunately, the inscriptions left by the Maya themselves are strangely silent on the topic. Following this collapse, Maya civilization continued on the northern tip of the Yucatán Peninsula, where Chichen Itza and Tula emerged as an important cities in the region. The widely popular conception that the Maya were driven from their cities by the Spanish Conquest is incorrect, as the cities were already vacant by the time of the Spanish invasion. QUESTIONS: 1. What were the characteristics and achievements of Mayan civilization? 2. What conditions may have led to its decline? Your answer must be in your own words and must be supported by specific information from the reading. Your answer must be a minimum of 75 words.