One-fifth of Earth's total fresh water supply is in ___.
a. the ocean
b. ponds
c. estuaries
d. groundwater
d. groundwater
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Which force is responsible for the direction of the Earth's ocean currents?
A. prevailing winds B. rising warm air C. convection currents in the mantle D. moon gravity effects
Which of the following does not affect the variable regions of immunoglobulins?
A) class switch recombination B) gene conversion C) somatic hypermutation D) None, they all affect the variable region.
Which of the following is not a chemical change?
A. a rock being crushed to powder B. grape juice turning into wine C. grass growing D. wood burning to ash E. a loaf of bread growing mold
What event constitutes a tragedy of the commons?
A. When a gold mining company accidentally spills 100,000 gallons of cyanide water into a stream B. When a logging company harvests trees at a slower rate than the rate they are replenished C. When Exxon-Mobile Oil company donates land for a new national park D. A environmental law that limits what private landowners can do on their own land if endangered species live there