Answer:
The upper respiratory system includes the nasal cavity (nose), the pharynx and larynx.
Explanation:
Air enters the body through the nose or mouth, this moistens and warms the air that enters since cold dry air will irritate the lungs. The air then travels down the voice box and down the windpipe.
Unsaturated fats - eaten in moderate amounts may lower your risk of heart disease.
B. Spinal nerves I think, it makes most sense to me.
Breaking the body into systems is in most cases a lot easier for the students to understand instead of just doing it all at once
