P represents heating and Q represent cooling.
this is because when you start from a liquid and turn to a gas the particles move faster making them farther apart, causing a gas. the opposite happens when you go from a liquid to a solid. the partials move closer together causing a solid to form. :)
It depends on how many points in total are in the class to determine that.
I would go with A. It seems the most obvious to be correct plus it is true.
<span>the impact that overgrazing have on afro-eurasian lands is : desertification
After overgrazing, the soils that cover that lands become very liable to erosion.
This led to the lands slowly lost its nutriets and eventually become sand and unable to sustain the living of many type of vegetations
Hope this helps. Let me know if you need additional help!</span>
