should divide or should be divided?

[ada1]

"A class should divide into 2 teams" or "A class should be divided into 2 teams"?

And one more question.

"improve knowledge of domestic animals" or "improve knowledge about domestic animals"?

[Casiopea]

[1] A class should divide (themselves) into 2 teams.
Meaning, on their own, by themselves.

[2] A class should be divided (by the teacher) into 2 teams.
Meaning, someone tells them to do it.


Could you give us the complete sentence for this example?

Ex: ... improve knowledge of/about domestic animals