The ozone layer is valuable because it blocks
A. heat.
B. UV radiation.
C. radio waves.
D. asteroids.
E. X-rays.
Answer: B
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The "background" species extinction rate
A. estimates how many extinctions humans are causing. B. estimates how quickly species disappeared before human intervention. C. measures today's extinction rate of animals. D. measures today's extinction rate of plants. E. All of the answer choices are correct.
Which type of staphylococcus is more likely to cause uncomplicated urinary tract infections in non-hospitalized hosts, especially sexually active young women?
A. Staphylococcus saprophyticus B. Staphylococcus aureus C. Staphylococcus epidermidis D. Staphylococcus intermedius
Rank these plant types from those that undergo senescence soonest after seed germination to those that live longest.
Ranking Questions __ herbaceous perennial __ biennial __ annual __ woody perennial
What energy molecule is produced during the light reactions and helps to power the Calvin cycle?
A) ATP B) glucose C) sucrose D) NADP+