Hi there.
Sleeping pills can be affective, one common side-affects are; "slower breathing" -- slower breathing is a common factor, as a side affect. Another would be "depressed breathing".
These happen for many reasons, forcing your body to sleep isn't on the "healthy" side of your body.
Sometimes, people do get addicted to sleeping pills; and take them every night and can lead to small or major health issues.
An unwanted pill that goes into your body every night will cause unwanted side affects. That can be very harmful!
The correct answer is B. Stomata
It is either carcinogens or viruses (I think the first) I hope this helps!
Answer:
Respiratory system and circulatory system.
The respiratory system allow living things to obtain oxygen from the air while the circulatory system allows oxygen to be carried around the body.
The correct answer is pollution.
