Barringer Crater in Arizona was formed when
a 300,000-ton asteroid slammed into Earth
50,000 years ago. Which of the following is
true about this event?
a. It hit so early that it had little influence on
the history of life.
b. This one produced about 150 times the
energy of the bomb that hit Hiroshima.
c. Its impact produced a minor crater.
d. Scientists recently disproved that an
asteroid impacted our planet just prior to
the mass extinctions at the K-T boundary.
e. An asteroid impact releases only minor
amounts of energy.
B
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A bacteria sample is taken from the immediate vicinity of a hydrothermal vent. You would expect for it to most likely contain
a. diatoms. b. hyperthermophiles. c. lignicolous fungi. d. cyanobacteria.
A person with carbohydrates A and B on the surface of their red blood cells will have which of the following blood types?
A. Blood type A, as A is dominant over B B. Blood type O, as A and B cancel each other out C. Blood type B, as B is dominant over A D. Blood type AB, as both A and B are present
The most widely accepted model for the evolution of modern humans is pictured here. What is this model called? 
A. Out-of-Africa and Replacement Model B. Hardy-Weinberg C. Multiregional continuity D. Replacement Model E. Out-of-Africa
Identify the following reaction: HCl + NaHCO3 ? NaCl + H2CO3
A) dehydration synthesis reaction B) hydrolysis reaction C) exchange reaction D) reversible reaction E) ionic reaction