Longitudinal dunes are _____
a. oriented parallel to the average wind direction
b. a type of barchan dune
c. a type of star dune
d. crescent-shaped dunes with arms that point upwind
e. only formed out of ice and snow
a
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Which of the following is a correct example of global warming creating a positive feedback?
A) Warming air melts permafrost releasing methane, a natural absorber of potent greenhouse gases. B) Less water evaporating will create more high level clouds causing the surface to warm. C) Warming oceans release more water vapor, a potent greenhouse gas that absorbs longwave radiation, further increasing temperature. D) Warming oceans release less water vapor, a potent greenhouse gas that absorbs longwave radiation, further increasing temperature.
An example of an autotrophic protist is
A) kelp. B) mosses. C) amoebas. D) choanoflagellates.
Which are the primary molecules of heredity?
a. carbohydrates b. enzymes c. lipids d. proteins
e. nucleic acidsThe region of Kerala in India demonstrates that improvements in health care and longevity are correlated with
A) decreases in literacy rates. B) increased reliance upon India's caste system. C) decreases in per capita income. D) reductions in total fertility rates and a high literacy rate.