Shown are ball-and-stick (1) and space-filling (2) models of methane. 
-What hybrid orbitals are used by carbon to form covalent bonds with hydrogen?
Definitions:
Combining Vowel
A vowel, often 'o' or 'i', used in medical terminology to ease the pronunciation between the word root and the suffix or between two word roots.
Cutting Out
The act of removing or excising a piece of material or a part of a structure.
Excision
A surgical procedure involving the removal of tissue, an organ, or other body part.
Combining Form
A combining form is a form of a word that only appears as part of another word, usually used in the formation of medical and scientific terms.
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