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.
X Means Christ: It's All Greek To Me. Archive of Comments and Discussions - Questions and Answers From All-Creatures.org. Our subjects cover: animals, religion (Christian, Jewish and others); diet and lifestyle (vegan and vegetarian); and other miscellaneous subjects.