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 chinese term xing means the process of one thing acting upon another. In relation to the five elements, the cycle of processes can be represented as: 1  wood feeds fire. 2  fire creates ashes which form earth.  inside the earth, metal which is heated liquifies and produces water vapor.