If a molecule of co2 released into the blood in your left toe is exhaled from your nose, it must passed all the following excepta. the pulmonary veinb. the tracheac. right atriumd. right ventricle

The correct answer is option a, that is, pulmonary vein.

Explanation:

After getting discharged from the left toe, the molecule of carbon dioxide is exhaled through the nose, and in the process, it moves via the trachea, the alveoli, the right ventricle, and the right atrium. However, it does not passes through the pulmonary vein as the prime function of the pulmonary vein is to carry oxygenated blood obtained from the lungs and to pass it to the heart's left atrium.  

The pulmonary vein is different from other veins found within the body, which carries deoxygenated blood or blood filled with carbon dioxide from different parts of the body to the heart. Thus, it is clear that carbon dioxide does not pass through the pulmonary vein.  

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."