What was the first line of evidence that the Cretaceous Mass Extinctions were caused predominantly
by a large meteorite impact? What will be an ideal response?
An abnormally high concentration of iridium was discovered in a 2.5 cm-thick clay layer in Italy,
which was followed by many more discoveries of high iridium in rocks that age. Iridium is common in
some meteorites, and the high concentration could be explained by a large meteorite impact.
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What color light shining on blueberries make them look black?
A. Yellow. B. Green. C. Magenta. D. Blue.
The term undernutrition refers to people who consume ____.
A. insufficient daily calories B. unbalanced meals C. the wrong kinds of food D. poor quality foods E. too much protein
At the north pole, the sun rises on about March 22, and sets on about September 21, thus there are six months of light and six months of darkness
Indicate whether the statement is true or false
In what part of the world is urban subsistence farming most prevalent?
A. India B. South Korea C. Ireland D. Asia E. Thailand