Which of the following correctly describes how bottled water and water in public drinking systems are purified?
A) They are usually both purified using chlorine.
B) They are usually both purified using ozone.
C) Bottled water is usually purified using chlorine, but public drinking systems are usually purified using ozone.
D) Bottled water is usually purified using ozone, but public drinking systems are usually purified using chlorine.
D
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Lightweight Jane and heavyweight Jack wish to parachute at equal terminal velocities. Jack should
A. pull upward on the supporting strands to decrease the downward net force. B. use a larger parachute. C. jump lightly. D. jump first.
Primary productivity measures the grams of carbon bound into organic material per square meter of ocean surface area per year
Indicate whether the statement is true or false
Which of the following best characterizes the function of introns?
A) They serve only as spacers. B) They serve only as enzymes to properly splice exons. C) They are most frequently spacers and rarely function as splicing enzymes. D) they are most frequently splicing enzymes and rarely function as spacers.
Pesticide resistance
A. has arisen only among insects. B. has arisen in hundreds of species. C. has emerged in a few species but more cases are expected. D. used to be a problem but modern pesticides are typically not susceptible to this problem.