Which word has the root word which means the shape and structure of something?

Which root word is used to indicate a structure that looks like, or contains a swelling?Multiple choice question.plex-gangli-flacc-cephal-

The foundation of a word is called a _____.Worth 5.000 points.A.   suffixB.   prefixC.   root wordD.   word’s base

A word with two or more root words in it is called this.Worth 5.000 points.A.   Complex wordB.   Combined wordC.   Compound wordD.   Compound vowel

Word parts can be called the _____ of words.Worth 5.000 points.A.   laddersB.   grammarC.   root wordsD.   building blocks

give me a list example about Morphology - the study of the formation of words.