The key special chemical used by chemosynthetic communities at salt seeps is ________.
A. methane
B. phosphate
C. silicate
D. nitrate
E. hydrogen sulfide
Answer: A
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During old-field succession, the graph clearly shows that the number of species increases with time. During what period of time is this rate of increase the greatest?
A) 0-20 years B) 60-100 years C) 40-60 years D) 20-40 years E) cannot be determined from this data
Suppose you are told that the area where you lived was once a shallow sea that evaporated. What kind of rock are you most likely to find that is related to that time?
A. Clastic B. Biochemical C. Chemical
Which of the following areas has the lowest total fertility rate (TFR)?
What will be an ideal response?
____________________ occurs when crystals form in bodily fluids
Fill in the blank(s) with correct word