CBSE Class 9 Biology Why Do We Fall Ill?
- differentiate between Vaccination and immunization
- chronic disease
- what are the common methods of transmission of diseases
- Which of the following disease have a long term effect? a)tooth infection b)intestinal infection c)chickenpox
- suggest any three steps that you will understand to maintain environment of hygiene
- What is virus
- A healthy person can be disease free but a disease free person can't be a healthy person why ??
- what is immunizations?
- what is immunizations?
- what is defficiency disease