How many nonbonding electrons are present in a molecule of water?
A) 2
B) 4
C) 6
D) 8
B
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What do the Permian and Cretaceous extinctions suggest about climate change?
A. Mass extinction events are usually the result of interaction with asteroids and other material from space, rather than climate change. B. Climate change can lead to mass extinction. C. Milankovich cycles underlie extreme climate change which can lead to mass extinction. D. Climate change can cause small-scale species extinction events.
In a battery, if the following oxidation-reduction reactions takes place normally: Mn2O3 + ZnO ? 2 MnO2 + Zn What reaction would be taking place if you were charging the battery?
A) 2 MnO2 + Zn ? Mn2O3 + ZnO B) ZnO ? Zn C) Mn2O3 ? MnO2 D) all of the above E) none of the above
Judge the following sentence according to the criteria given below: Reef-building corals are able to survive in nutrient-poor tropical waters BECAUSE they receive most of their nutrition from symbiotic zooxanthellae algae
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
After they were forced to leave Palestine by the Romans, Jews clustered in Muslim lands of the Iberian Peninsula because Islam showed greater tolerance for Judaism than had Christianity
Indicate whether the statement is true or false