Which of the following are secondary messengers?
A) prostaglandins
B) thromboxanes
C) both a and b
D) neither a nor b
C
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If you were a petroleum geologist searching for oil deposits (derived from ancient biomass), why would you want to know the positioning of these landmasses hundreds of millions of years ago? What climate region would you look for?
What will be an ideal response?
A cloud that forms liquid droplets has a relative humidity of 100 percent with respect to the liquid droplets. If temperature is <0°C and ice crystals form in this cloud, the relative humidity will be ________ with respect to the ice crystals
A) 100 percent B) 0 percent C) less that 100 percent D) more than 100 percent
Why will an iron-rich olivine have a higher density than a magnesium-rich olivine?
A) More magnesium is needed to equal the same atomic charge as iron. B) Iron-rich olivine has smaller crystals, so more of them will fit into the same area. C) Magnesium-rich olivine has more silicon, which is less dense. D) Iron has a greater atomic mass than magnesium and therefore is heavier.
The predominate system of agriculture practiced in Subsaharan Africa is
A) subsistence cultivation. B) intensive subsistence wet rice dominant. C) mixed crop and livestock. D) pastoral nomadism. E) dairy.