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.
Dry, Subtropical Climate. High-pressure cells at the Tropic of Cancer keep conditions dry and subtropical in the northern Sahara Desert. The hottest temperature on record for this region is 136.4 degrees, but winter evenings can get surprisingly cool, falling to around 55 degrees.