If snails and elodea (an aquatic plant) are placed in various combinations inside test tubes and left in the dark (see diagram below), what would be the gas collected from test tube B _, and what would be the gas collected from test tube C _? A. oxygen in B and oxygen in C
B. carbon dioxide in B and oxygen in C
C. carbon dioxide in B and carbon dioxide in C
D. oxygen in B and carbon dioxide in C

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.