Hi! This fourth part was very interesting! I liked the homeworks idea, although I think I didn't do very well with the answers... Anyway, I learned a lot of things. I leave the link:
https://ecency.com/hive-196387/@agreste/spa-eng-citizen-science-project-c55c1fa0bdf04
Cheers!
Please don't worry! As I wrote as a comment to your report, you did very well. :)
Thanks again for your hard work!