Los alumnos no deben (shouldn’t) a. enseñar la clase c. tomar apuntes b. prestar atención d. estudiar

The phrase enseñar la clase means to teach the class. This is the correct answer because students don't teach the class. This is reserved for teachers. Students can take notes (tomar apuntes), pay attention (prestar atención) and study (estudiar). Finally, this sentence can be written as follows:

Los alumnos no deben enseñar la clase

toilet paper: papel higienico

polar bear: oso polar

elephant: elefante

the only thing that makes sense that you couldn't find in a porta-potty, that should be there, would be toilet paper.

hope this

c. its asking which of the words need an accent mark. its spelled biografía