Answer — Exercise 4

TEXT A

1. In the digestive system.
2. They cause disease.
3. Because we all have different gut microbiomes.
4. It affects the way individuals respond to drugs and in turn it is affected by e.g. antibiotics.

TEXT B

1. Through dirty hands.
2. It gets rid of the ‘good bacteria’ too.
3. To avoid the risk of infection.
4. The bacteria in its saliva may boost your immune system.