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 Sahara Desert is considered one of the harshest climates on the planet, due to its variable high temperatures during the day and the rapid and sometimes significant cooling in the night. The Sahara is the largest desert on the planet.