Which of the following describes the process of electrical discharge during cloud-to-ground lightning?
A. The stepped leader travels downward, and the return stroke travels downward.
B. The stepped leader travels upward, and the return stroke travels downward.
C. The stepped leader travels downward, and the return stroke travels upward.
D. The stepped leader travels upward, and the return stroke travels upward.
Answer: C
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In humans, the maintenance of a warm, stable body temperature around 37 degrees Celcius is
A) an example of homeostasis. B) a result of fMRI. C) the result of feedback regulation of blood pH. D) one of the functions of melatonin.
Judge the following sentence according to the criteria given below: The rate of sea ice formation slows as sea ice thickens BECAUSE the ice insulates the underlying water from freezing due to its poor heat conduction
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.
Cities in many developing nations have a disproportionately high share of their nation's wealth.
Answer the following statement true (T) or false (F)
What is an example of symbiosis?
a. environmental resistance b. carrying capacity c. succession d. progression e. commensalism