The main difference between Bright and Dark Nebulae is ________
A) their proximity to a blue star
B) the composition of their dust
C) the composition of their gases
D) their proximity to a black hole
E) none of the above
A
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According to the WHO, the greatest global root cause of risk of disease is
a. infectious disease. b. heart disease. c. poverty. d. cancer.
An index fossil must be:
a) limited to a particular region b) very rare c) long-lived in terms of geologic time d) easily identifiable in the field e) all of the above
The difference between fog and a cloud is:
A) they form via a different process. B) fog never forms in mountains. C) clouds can have ice crystals in them but fog can't. D) nothing. Clouds and fog are a matter of observational perspective.
What Latin American country has promoted a "myth of racial democracy"?
A) Mexico B) Brazil C) Chile D) Argentina E) Bolivia