The three main categories are health, disease and safety.
Electrocardiography (EKG) can be measured both noninvasively with electrocardiogram (and it's the most common, totally safe and painless method), as well as invasively with implantable loop recorder (used in extraordinary circumstances).
Carbohydrates, Lipids and proteins
Answer:
A. A snake is used to cold weather in fact they prefer it.
