How many groups did Aristotle use to divide all the organisms in the world?

Arepair man charged $93.06 the price included 2 hours of labor and 40 service charge how much does the repairmen charge per hour for labor?

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

Photosynthesis uses co2 and cellular respiration produces co2. we call the point when the two processes are in balance--when there is no net production of co2--the compensation point. how might you limit one of the processes in order to achieve a compensation point?