In a controlled experiment, ________
A) you need only a single experimental organism which is tested again and again
B) the researcher controls for the effects of all variables except one
C) the researcher has several hypotheses, one of which will be proven correct
D) the experimental organisms have all been used before and given good results
E) the researcher knows the outcome before beginning the experiment
B
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Future supplies of natural gas are likely to be more abundant than oil reserves.
Answer the following statement true (T) or false (F)
Stratospheric ozone destruction involves a complex series of reactions. The first significant reaction involves ________
A) UV radiation from sunlight breaking apart O3 molecules B) ultraviolet (UV) radiation from sunlight causing Cl atoms to break free from CFCs C) O3 reacting directly with CFCs D) O3 reacting with industrial sulfuric acid
The peeling of thin layers of stone off a large rock is ________
A) carbonation B) hydrolysis C) scree D) exfoliation E) explosion
Botswana has transitioned more smoothly than other African countries into a stable political system with a fast-growing economy.
a. true b. false