Answer:
'ation' - - - > Observation
Step-by-step explanation:
The verb observe denote an action. To observe. By adding suffix which appear at the end of English words, we can change the behavior or the word type different words fall under. Suffix include 'ING', 'ation', 'aic' and so on. To change the word observe which is a verb to a noun, we add 'ation' to the end of observe which serves as its a suffix. This changes the verb observe to the noun OBSERVATION, which is a process of observing in the simplest form.