Read these definitions from a specialised dictionary and choose the words

Read these definitions from a specialised dictionary and choose the words which fit them. Use the words from the box. There are three extra words 1. ... n Those items which make up the environment of an object, substance or organism and which may have an effect on a process in which the object, substance or organism is involved e.g. the presence of oxygen (air) and water are a necessary ... for the rusting (ржавление) of iron. 2.... adj. A part of a whole is ... if, when removed, the identity of the whole is destroyed, i.e. the whole can no longer be identified, e.g. a wick (фитиль) is essential to a candle because if a wick is removed only a block of paraffin wax is left, which cannot be identified as a candle. 3. ... n An idea that is suggested as a possible way of explaining a situation, or proving an idea, etc., which has not yet been shown to be true. 4. ... n A rule, principle, definition or standard used to test or to assess a statement, fact or object for placing it into a class. E.g. the ... for assessing speaking ability is both accuracy and fluency. 5 ... n Any property we have knowledge of, directly or indirectly, through our senses, e.g. magnetism, mass, atmospheric pressure, electricity or gravitation is a ... . 6. ... n The intentional use of the senses for a special purpose, e.g. when a seed is germinated (проращивать), a student records the ... on the events and the changes in form which take place. observation condition sophisticated hypothesis procedure criterion essential phenomenon applied