What are the disadvantages of using OPAC?

How does a swamp cooler cool air? How many drops in 25 ml? Why are nonmetals used for making handles of pots? What process should be undertaken regularly to make sure no data is lost? Does the blue flame on a Bunsen burner need the air hole open or shut? Researchers performing a well designed experiment should base their conclusions on? What is investigatory process? Which is the best description of how the fossil record provides evidence of common ancestry? What does 40 C equal in Fahrenheit? What is the chemical structure in the human genes? How many grams of potassium iodide will produce 750 grams of silver iodide when there is an excess of silver nitrate? What happens when you rub vinyl with wool cloth? Definition of control in the scientific method? What is the lub-dup sound of your heartbe? What are some different types of prejidice? How many germs are on a pinhead? What happens to the atoms in water when water boils? What are 3 things that cause mechanical weathering? Is evolution a theory and not fact? When will the voyager or pioneer satellites reach the nearest stars?