Cómo sabe la célula qué tipo de proteína corresponde sintetizar en cada momento ?

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?

On a spring day, a middle-latitude city (about 40? north latitude) has a surface (sea-level) temperature of 10 ? c. if vertical soundings reveal a nearly constant environmental lapse rate of 6.5 ? c per kilometer and a temperature at the tropopause of –55 ? c, what is the height of the tropopause?