One major advantage of using hydrogen fuel cells is ________
A) that the cells are nonpolluting
B) the potential for production of greenhouse gases
C) the energy efficiency
D) methane is produced as a by-product
A
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____________________ refers to the permanently frozen subsoil of the subarctic regions
Fill in the blank(s) with correct word
Explain how soil biota can be killed by human actions and some of the effects
What will be an ideal response?
When the Sun and Moon are neither in conjunction or opposition, the ________ occurs and results in the ________ tidal range between low and high tides
A) spring tides; lowest B) spring tides; greatest C) neap tides; lowest D) neap tides; greatest
Which of the following is a possible reason for a decline in birth rates?
A) improved education B) improved health care C) access to birth control D) gender equality E) all of the above