This is a Discussion Assignment.
There are 4 units, and there are two topics per unit. Total 8 topics. Every topic need 2 paragraphs, every paragraph need 50~100 words.
Based on the information in the additional materials, choose two topics every unit, write 2 paragraphs , no need to include everything, just related topic is ok. Every unit need at least one reference and citied with APA format.