Vectors can be defined as:

Which one of the following has a long-term effect on the health of an individual?

Priya's mother uses iodised salt at home. One day while cooking,Priya asked her mother about iodised salt. She said people who do not use iodised salt suffer from deficiency of iodine which leads to goitre and hypothyroidism.
$(a)$ What are the physical symptoms of goitre and hypothyroidism?
$(b)$ How will you inform others about the importance of iodised salt?
$(c)$ Is iodine a metal or a non-metal?
$(d)$ What are the physical properties of iodine?
$(e)$ What is the difference between iodised salt and normal salt?

State whether the following statement is true or false:
Chronic diseases have very drastic long-term effects on people's health as compared to acute diseases.

We should not allow mosquitoes to breed in our surroundings because they :

What are two approaches to treat any infectious diseases?