Approximately how long would it take for CO2 levels to return to nineteenth century levels if we cut emissions by 90% immediately?
A. hundreds or thousands of years
B. 1 month
C. 6–12 months
D. 10 years
E. 100 years
A
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Anchovies are an efficient fish to catch because they:
a. are grazers. b. are filter feeders. c. travel in large dense schools. d. are small fish. e. swim quickly.
Which of the following events occurs last in an action potential?
a. Opening of voltage-gated Na+ channels b. Closing of voltage-gated Na+ channels c. Opening of voltage-gated K+ channels d. Closing of voltage-gated K+ channels
Alexander Fleming kept finding mold contamination that was killing his bacterial cultures. This observation eventually lead to the development of the antibiotic penicillin. Why would a fungus produce a compound that is selectively toxic to bacteria?
A. Killing bacteria is an accident. B. Fungi are killed by bacterial toxins. C. Fungi compete with bacteria for resources. D. Fungi eat bacteria.
In hominid evolution, which came first?
A. larger arms B. bipedalism C. bigger feet D. large brains