Given the equations below, which description best fits the physical situation? 
A. A projectile's displacement two seconds after being fired downward with a speed of 30.0 m/s.
B. A projectile's displacement two seconds after being fired downward with a speed of 40.0 m/s.
C. A projectile's displacement two seconds after being fired downward with a speed of 50.0 m/s.
D. A projectile's displacement two seconds after being fired downward with a speed of 60.0 m/s.
E. A projectile's displacement two seconds after being fired downward with a speed of 80.0 m/s.
Answer: B
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An explosion of genetic diversity similar to that which occurred during the Cambrian Period hasn't happened recently, most likely because
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