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.
Xia Dynasty is the first unified major power with a slave-owning system in Chinese history. According to the legend, Yu the Great won people's trust because he conquered floods and tamed rivers in the 21st century B.C. He was later chosen as chief of his clan. Since Yu was titled in a place called Xia.His clan was thus name. After Yuâs death, the hereditary dynasty established by Qi who is Yu's son is known as the Xia Dynasty, which was the first dynasty which was a slave-owning society in China.e was later chosen as chief of his clan. Since Yu was titled in a place called Xia. His clan was thus name. After Yuâs death, the hereditary dynasty established by Qi who is Yu's son is known as the Xia Dynasty, which was the first dynasty which was a slave-owning society in China.