1. Edit the text to fix some issues according to the APA 7th guidelines for lang

1. Edit the text to fix some issues according to the APA 7th guidelines for language:
Make adjustments to improve:
*continuity and flow with smooth cadence of words, and sentences.
*transitions for improving connections with all paragraphs in each section.
*conciseness, clarity and active voice.
2. Substitute the sources of citations that are older than 2012 for sources that have similar concepts, findings or discussions of the idea being made by the citation for a new source that is from 2012 or after 2012.
3. Add 15 in-text citations.