Educació i Ensenyament de les Ciències
This activity is directed to secondary school 14-18 years old students. As you can see, the site is directed to students, so you can propose them directly the web adress to undertake the activity. This is one of the reasons why correct answers are not provided (further explanation in IBSE).
Link to the activity: https://sites.google.com/site/heredityid/home