Paul has measles
Paul is sick, he has measles. He cannot go to school or go out play with his friends until his cells learn how to defend him against the virus that made him sick. But, what is a virus? Why do we catch a virus? And, why vaccines ar important?
URL del recursohttps://s3.amazonaws.com/paulmeasles/PTS_English.pdf
Subárea de conocimiento
- Biotecnología