In the last century, human activities have caused dramatic increases in concentration of many greenhouse gases.
Answer the following statement true (T) or false (F)
True
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The equatorial regions of the African continent are dominated by which two climate categories?
A) BS/BW ? steppe and desert B) Af/Ca ? tropical rainy and humid subtropical C) Af/Aw ? tropical rainy and tropical savanna D) ET/EF ? tundra and ice cap E) Aw/Cs ? tropical savanna and Mediterranean
Phytoplankton is responsible for the synthesis of 90% to 96% of the surface ocean's carbohydrates. Indicate whether the statement is true or false
Algal biofuels are considered viable alternatives to land-based crops such as corn and soybeans because ________.
A. algae do not compete with food production B. algae can be grown on wastewater C. growing algae does not require farmland D. All of these choices are correct. E. None of these choices is correct.
Strontium-90 is a radioactive isotope which is particularly hazardous. Which of the following statements is true about an atom of strontium-90?
A) It contains 52 neutrons. B) It contains 52 protons. C) It contains 90 neutrons. D) It contains 90 protons.