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.
â¢ GI (noun) The noun GI has 1 sense: 1. a unit of magnetomotive force equal to 0.7958 ampere-turns. Familiarity information: GI used as a noun is very rare. â¢ GI (adjective) The adjective GI has 1 sense: 1. of or relating to the stomach and intestines. Familiarity information: GI used as an adjective is very rare.