The elements of a crime are the requirements a prosecutor must prove to convict a defendant of a crime. The elements of a crime are who, state of mind (mens rea), conduct ( actus res), causation, defenses (eg. self defense), grading (levels of crime eg. first degree murder, secondary degree murder, manslaughter, etc.) , surrounding circumstances (inferences of guilt or nonguilt). You are required to use the Illinois Criminal Statutes for Second Degree Murder and Involuntary Manslaughter. Reading the statute, take the wording in the statute and apply it to each element of the crime if applicable.
Here is the link for second degree murder: http://ilga.gov/legisl