What are the advantages of working on assignments in several short sessions over a period of time rather than in one longer session all at once?

How do the uv rays cause damage?   what exactly causes the skin to burn;   can you be more specific about this mechanism?   3. how do photosensitive medications increase a person's sensitivity to sunlight and therefore increase their risk of getting burned?     what kind of medications can increase photo-sensitivity, can you think of some examples?

Foods that are required to be held hot must be

What are used to respond to uncomfortable situations.