your Question is unclear.
She is a medicinal chemist, hence one of her main assignments would be to produce drugs for certain diseases. This could involve several subtasks like identifying chemical substances, analyze which substances can dissolve another and finding catalysts or enzymes for certain reactions and also simpler procedures like annihilating a base with an acid.
It's harder to block sound because sound waves and transverse waves, causing the sound to bounce off objects. This isn't the same with light.
The sun is the original source for ALL food webs
