The subdivision of the geologic time scale that represents the longest time span is called a(n) _________
a. epoch
b. era
c. period
d. stage
Answer: b. era
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Less water is available for evaporation in cities. Why is this so?
What will be an ideal response?
Most of the recent global warming is due to an enhanced greenhouse effect caused by increasing levels of greenhouse gases, such as CO2
a. True b. False
Approximately ________% of the world's marine fish populations are either fully exploited or overexploited
A) 20 B) 40 C) 50 D) 60 E) 80
From the following statements and questions, which is the best example of deductive reasoning?
A. In repeated tosses of a coin, there is a 50/50 chance of each toss resulting in a "head" B. If all insects have six legs, then butterflies have six legs C. How many times will the toss of coins turn "heads-up" if 100 times toss a coin? D. Since every insect I have examined so far has six legs, I conclude that all insects must have six legs E. All of these are examples of deductive reasoning