Genetic variations within a species are most likely the result of?

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

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?

Match each phylum or class to its correct characteristic