I turned in this exact assignment today haha
the blood vessels dilate to draw body heat away from the body and towards the surface of the skin
sweat glands release sweat, when sweat evaporates it releases heat
They burn up and cause it to look like shooting stars
I would see chemical constitution and physical components are not changed.
Because physical reaction won't change the component itself
In a neutral ionic compound, you can determine its sub-scripts by simply flipping the ionic charges and dropping the signs: so AlS would be Al2S3