A scientist performs an experiment to see if acids have an effect on the health of a particular type of plant. Three sets of plants were treated with various acidic solutions of known pHwhile the control set was treated with a solution of .

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

Explain why biological control methods are generally environmentally superior to chemical pest control methods.

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?