BUILDING BLOCKS. Overview. Macromolecules form when smaller molecules (building blocks or subunits) come together. Monomers are joined by covalent bonds to form polymers.
The coldest temperature in the Sahara desert is 36 degrees. Well, it depends on where in the desert, but it can reach below freezing. Its colder nearer to the ocean and warmer towards the center of the desert.
The combined conditions of an unstable marine and stable continental air masses result in an arid, tropical climate in the southern Sahara Desert. Average temperatures are lower here than in the north, particularly at higher elevations. In fact, the highest parts of the southern Sahara Desert get snow during winter.