An explosion of genetic diversity similar to that which occurred during the Cambrian Period hasn't happened recently, most likely because
A) evolution of life on Earth is no longer occurring
B) such an explosion can occur only for simple organisms and not complex ones
C) there are no more ecological niches available to allow this to happen
D) of the widespread presence of efficient predators that make it much more difficult for entirely new organisms to appear
D
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A force on an object is given by F(x) = ( -4.00 N/m)x + ( 2.00 N/m3)x3. What is the change in potential energy in moving from x = 1.00 m to x = 2.00 m?
A) 10.0 J B) -1.50 J C) -10.0 J D) +1.50 J E) 12.0 J
Heavy snow showers along the western slopes of the Rockies are most likely caused by a
A) continental tropical air mass. B) maritime tropical air mass. C) continental polar air mass. D) maritime polar air mass.
Neptune was discovered as a result of perturbations observed in the orbit of ________
Fill in the blank(s) with correct word
A quantity which is conserved in the collision of a car and a truck is
A. kinetic energy. B. total momentum. C. potential energy. D. momentum of the truck. E. momentum of the car.