How do drugs that doctors provide, help combat viruses?

Based on the results of this study, what questions remain unanswered? how can these questions guide future research

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

How do living things obtain phosphorus