What is the difference between AM radio waves and FM radio waves? An FM wave varies in amplitude; an AM wave varies in frequency. FM waves are better reflected by particles in the Earth’s atmosphere. AM waves travel short distances along the Earth’s surface; FM waves travel farther. An AM wave varies in amplitude; an FM wave varies in frequency.

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.