Photovoltaic electricity costs are ________ coal or nuclear-powered electricity.
A. incomparably more expensive than
B. substantially less than
C. the same as
D. unlikely to become as cheap as
E. likely to be cheaper in the near future than
Answer: E
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Suppose a tropical storm in the Gulf of Mexico moves westward across Central America and out over the Pacific. If the storm maintains tropical storm strength the entire time, it will be given a new name once it moves over the Pacific Ocean
a. True b. False
In toxicity testing, the dose of a chemical above which there is a measurable decline in the health of the organism being tested is referred to as ________
A) acute exposure B) median lethal dose C) the toxicity threshold D) chronic exposure E) the dose-response
European rabbits were introduced into Australia and quickly spread, reproduced, and became a terrible pest. They eat up to $600 million worth of food and pasture crops annually, and have damaged the populations of many native plants and the populations of animals that eat the plants. Twice in the past 50 years, rabbit diseases have been introduced to try to control the population, with some success. This is a case where ________.
A) an invasive species has caused overharvesting B) climate change has decreased the genetic diversity of indigenous species C) an extirpation has occurred D) an invasive species has reduced the genetic diversity of indigenous species E) habitat alteration resulted in decreased biodiversity
The Black Hills of South Dakota is a good example of what type of geologic structure?
What will be an ideal response?