Which pair of bases is linked together by three hydrogen bonds?
A) adenine and cytosine
B) adenine and thymine
C) guanine and cytosine
D) guanine and thymine
C
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Clays which change to a near-liquid state as a result of sudden disturbance are _______ clays.
a - scree b - mudflow c - talus d - quick e - none of the above
Today, many of the old dumps and landfills from past decades are now
A) festering sites of toxic waste that must be fenced off and restricted. B) parks and recreational areas widely used by the public. C) being mined for the resources that were buried over several decades. D) deep depressions, resulting from the decay of most of the materials that were buried long ago.
When we burn fossil fuels, ________
A) the greatest environmental impact is the impact on the ozone layer B) the greatest environmental impact is the local damage from extraction C) the resulting carbonic acid leads to acid rain D) the greatest environmental impact is increased greenhouse gases E) we liberate carbon back into the carbon cycle, increasing the amount available for plant growth
An air temperature of 21°C feels quite comfortable. If you were in 21°C water, it would feel cold. Explain why.
What will be an ideal response?