Question

1.How does salt and sugar help in food preservation?
2. A child was given hepatitis B vaccination. Much to the surprise, child's body started to show opposite
within few days. What is this reaction called? Why do you think this happened?
3. When we are sick or suffering from fever, doctor prescribes us antibiotic medicines. How do you think
antibiotics work inside human body? If humans have their own immune system to fight against diseases
then why do we need antibiotics?​

Answer 1

Answer:

you can solve it step by step