Answer:
Aspirin, ibuprofen, or acetaminophen.
Explanation:
The correct answer is (b) <span>They can be directly observed.</span>
They do the same thing that all living and breathing things do! They breathe! When they breathe they are doing the same thing you are doing all day everyday. Inhaling oxygen and exhaling carbon dioxide.
The overall biodiversity in the Gulf of Mexico has gone down since the Deepwater Horizon spill. I hope this helps.
