Astudent measured the amount of oxygen and carbon dioxide dissolved in an aquarium containing an aquatic plant and a snail. why did the amount of dissolved oxygen decrease when the aquarium was kept in the dark for 10 hours? a. because photosynthesis could not occur  b. because the plant died  c. because the snail died  d. because cellular respiration could not occur

The answer is A. Putting the aquarium in the dark means that the aquatic plants will not be able to photosynthesize.  The process of photosynthesis produces oxygen as a by-product. The oxygen is used by the fishes in respiration and release carbon dioxide. The carbon dioxide is used by the aquatic plants in photosynthesis.

answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

explanation:

trachea, alveoli, lung capillaries, arteries