Which two photos show electric force in action?
A.
B.
O c.
D.

Which of these resources is used worldwide to make construction products, pottery, and porcelain

In what for do plants utilize nitrogen? why do they need nitrogen?

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants. d. selecting individuals at random.