I believe you are asking about the "triangle" we were tought a simple triangle. Cells at the bottom because there are the most of them, tissues next, organ next, and organ system at the top. So I believe the answer you are looking for is Organ System.
More than 4 million Americans take opioid prescription pain relievers for nonmedical uses. More than 400,000 Americans use heroin, a powerful opiate drug. Many people report misusing prescription opioids before starting to use heroin. Each year, more than 28,000 Americans die from opioid overdoses.
Answer:
It seems D; By introducing no-tolerance policies in school, would be the most logical answer
The lungs and respiratory system allow oxygen in the air to be taken into the body, while also letting the body get rid of carbon dioxide in the air breathed out.
Minor superficial scratches to the cornea will usually heal by themselves within 2-3 days
