Which of the following is the main advantage of experiments? the researcher can make causal statements. the research is ecologically valid. the findings generalize to other situations. they allow the researcher to generate many hypotheses.

Arrange the following in order from the shortest wavelength to the longest wavelength. visible light gamma rays radio waves x-ray waves microwave infrared

Most signs are diamond-shaped, with a yellow background and black letters or symbols. a. regulatory b. guide c. warning d. construction

You find a mysterious, dull substance on the ground and pick it up for a closer look. it is powdery, very light, and soft to the touch. the substance is most likely i. an organic mineral ii. a metallic mineral iii. a nonmetallic mineral i only ii only iii only i and ii i and iii