Every living organism has what classification groups as its name?

Why do we perceive objects as retaining their brightness under different lighting levels?

What does it mean for an allele to be dominant?

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?