Could it be that you mistyped and what you meant was:
Who heads up the department of Justice under the executive branch?
The head of the Department of Justice (which is part of the executive branch, not the judicial), is the Attorney General. Currently, the Attorney General is Loretta Lynch.
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Paper money is made out of trees, and wood is also made from trees.
He most likely used tinker v Des Moines because he would claim that schools aren’t allowed to censor the opinions of students.
Evolutionary
An evolutionary perspective is when a person looks at the human mind and human behavior and attributes it to an evolutionary survival adaptation. In this case, the professor believes that it is an evolutionary advantage to pair-bond.