The death toll from lightning in the United States has ________ since the 1920s
Fill in the blank(s) with the appropriate word(s).
Answer: decreased
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A mosquito flying at 2 m/s encounters a 2-m/s breeze blowing in the opposite direction, giving it a resulting speed over the ground of
A. 6 m/s. B. 3 m/s. C. 4 m/s. D. 0 m/s.
The origin and early diffusion of language families predate recorded history
Indicate whether the statement is true or false.
Fire history in an open pine woodland ecosystem would be best determined by ________
A) ambient air temperature B) soil chemistry C) charcoal in the soil D) tree ring scars E) the density of vegetation
Which of the following would best represent a clumped population distribution pattern?
A) a pod of 40 migrating gray whales in the Bering Sea B) pine trees within a pine plantation C) earthworms in the soil of a garden D) eagles nesting in the tallest trees in the Grand Canyon E) oaks planted on city streets