Approximately 40 grams of the radioisotope iodine-131 were accidentally released into the atmosphere during the Fukushima nuclear accident. The half-life of iodine-131 is 8 days. How long would it take for there to be 10 grams of iodine-131 left in the
environment?
A) 8 days B) 12 days C) 14 days D) 16 days E) 23.7 days
Answer: D
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During the climatic optimum, ____
A) the climate favored the development of certain plants B) average temperatures were colder than at present C) continental ice sheets began to melt D) alpine glaciers began to advance down river valleys
The relationship between the dung beetles and the disease-carrying flies is a type of
A) mutualism. B) commensalism. C) intraspecific competition. D) interspecific competition.
Firefighters set backfires to reduce or eliminate fuel for an advancing wildfire.
Answer the following statement true (T) or false (F)
What methods do scientists use to reconstruct both long-term and shorter term climate histories?
What will be an ideal response?