Digital services that are supplied on-line are difficult to track by conventional taxation and tariff systems
Indicate whether the statement is true or false
TRUE
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Metamorphism takes place ____
A)as country rock is melted by contact with magma B)while rocks remain solid C)without high temperatures as long as rocks are buried at great depth D)without high pressure, as long as high temperatures are present E)only with fluid activity
The U.S. Environmental Protection Agency currently recommends that regulators assume children face a risk ____ times that of adults when exposed to carcinogenic chemicals
a. 5 b. 10 c. 25 d. 50 e. 100
Costs of pollution control tend to
A) decrease over time because of initial investments in reductions and new technologies. B) decrease over time because regulations generally become less restrictive. C) increase over time as levels of acceptable pollution become increasingly restrictive. D) increase over time as new technologies require renewed investments.
Diatoms, important producers in the epipelagic open ocean, are members of the Division ________
A) Angiospermae B) Chrysophyta C) Chlorophyta D) Haptophyta E) Pyrrophyta