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.
Answer: b
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which the immune system attacks and destroys
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In a flower, the mature male gametophyte is
a(an)
a. pollen grain. b. germinated pollen grain. c. ovule. d. microspore. e. sperm cell