After the easily removed portion of a natural resource (e.g., coal) has been taken, the cost of removal goes up with each additional unit of the resource taken. This is called the marginal cost.
Answer the following statement true (T) or false (F)
True
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Long scratches formed on bedrock when a glacier moves over a land surface are ____
a. tillites b. moraines c. striations d. drumlin e. cirques
Which of the following is not true of annexation in the U.S.?
A) Rules concerning annexation vary among states. B) Normally, land cannot be annexed into a city even if a majority of residents in the affected area vote in favor of doing so. C) Peripheral residents generally desired annexation in the nineteenth century, because the city offered better services, such as water supply, sewage disposal, and trash pickup. D) Today's cities are surrounded by a collection of suburban jurisdictions whose residents prefer to remain legally independent of the large city. E) As U.S. cities grew rapidly in the nineteenth century, the legal boundaries frequently changed to accommodate newly developed areas.
The Cenozoic Era has been 66 million years long. This is only ____________________ percent of all geologic time. (Use one decimal point in your answer.)
Fill in the blank(s) with correct word
Animal predators tend to kill the sick, weak, aged, and least fit members of a species because they are the easiest to catch.
Answer the following statement true (T) or false (F)