Which event or principle CANNOT have its validity directly tested by laboratory experiment? Select one:

a. the big bang theory

b. the conservation of energy

c. the periodicity of element properties

d. the acceleration of objects due to gravity

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?

Which of the following is a common response to cell signaling?

Which plate boundary causes plates to collide forming mountain ranges, volcanoes, and island arcs? give an example of this type of plate boundary. 2. at which plate boundary do rifts and mid-oceans ridges form? give an example of this type of plate boundary. 3. at which plate boundary do plates slide past each other while moving in opposite directions? give an example of this type of boundary.