At the core of biology and other sciences lies a problem-solving approach called the scientific method. 1  Make an observation. 2  Ask a question. 3  Form a hypothesis, or testable explanation. 4  Make a prediction based on the hypothesis.  Test the prediction.
Xi. Xi is the 14th letter of the Greek alphabet. It is pronounced in Modern Greek, and generally or in English. In the system of Greek numerals, it has a value of 60. Xi was derived from the Phoenician letter samekh. Xi is not to be confused with the letter chi, which gave its form to the Latin letter X.
The Xia dynasty (Chinese: å¤æ; pinyin: Xia XiÃ ; ChaoâChÃ¡o: Wade-Giles'hsia; [ch ao] ; Éia. ÉiÃ¢ â tÊÊ°ÉÌÊÌ¯. c 2070) c 1600 bc is the first Dynasty in. Traditional chinese history it is described in ancient historical chronicles Such As, the Bamboo annals The classic of History and the Records Of. the grand historianhe Xia was later succeeded by the Shang dynasty (1600â1046 BC).