The parts of the model shown here illustrate the levels of organization found in the human respiratory system. Number the parts from 1 to 4 to show the correct order from the simplest to the most complex.

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.

Adilute aqueous potassium nitrate solution is

If you need to add 27.50ml of a solution, which piece of glassware would you use to deliver this volume and explain how you would determine if the 27.50 ml was measured?