For an investigation a student records data about four unknown substances. The student then calculates the densities of the unknown substances and compares them with the table of densities of known substances shown below. (Density = mass/volume ) Which unknown substance is most likely carbon?

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.