The most serious drawback to fuel cells is the expense of providing an oxygen source.
Answer the following statement true (T) or false (F)
False
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Which of these countries has the lowest share of proven natural gas reserves?
A. United States B. Russia C. Qatar D. Iran
What contributes to the high biological activity and surface nutrients in southern polar waters?
A) Deep-water upwelling B) Weak stratification C) There is a lack of continental margins D) All are contributing factors
Forming the cell walls of stems, leaves, and roots, what compound is the primary structural constituent of plant tissues?
A) protein B) starch C) cellulose D) enzymes E) chlorophyll
Which of the following can be a chronic effect of pesticides on humans?
A. Immune system problems B. Fetal deformities C. Cancer D. Parkinson's disease E. All of these are correct