Although unusually high, extinction rates may be
A) declining because of overestimates of some groups in some ecosystems.
B) declining because fewer species are becoming threatened worldwide.
C) even higher because of the loss of tropical forests.
D) even higher because of intense predation in many grassland ecosystems.
C
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Phil tosses a ball horizontally from a rooftop. One second after leaving his hand the ball's vertical component of velocity is about
A. 20 m/s. B. 10 m/s. C. 14 m/s. D. 5 m/s.
IPCC stands for Intergovernmental Panel on Climate Change.
Answer the following statement true (T) or false (F)
In an earthflow, soil moves downslope as a coherent mass.
Answer the following statement true (T) or false (F)
Which of the following statements about peppered moths in England is FALSE?
A. In polluted areas, dark moths survived better than light moths. B. After pollution control laws were passed, dark moths became more common than light moths in urban areas. C. Bernard Kettlewell's experiments suggested that bird predation was responsible for evolution in peppered moth coloration. D. In the countryside, light moths survived better than dark moths.