Hotter it gets the more the pressure, the particles start bouncing faster when it gets hotter, therefor making the pressure higher
Carbon can form a wide variety of organic compounds because:
Each carbon atom covalently bonds with toms of carbon, hydrogen oxygen, and nitrogen
A carbon atom can have 4 single valence electrons around it. This allows it to form covalent bonds with many different atoms.
It has the same composition throughout, unlike a heterogeneous which has visibly separate substances