Which of the following have tentacles armed with stinging cells called nematocysts?
A) Cnidarians
B) Coccolithophores
C) Ctenophores
D) Foraminifers
E) Radiolarians
A
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Dean plays with the swinging-balls demonstration. If one ball is released and two balls pop out at half the speed
A. kinetic energy is conserved. B. momentum is conserved. C. both of these D. none of the above
During the afternoon the greatest temperature difference between the surface air and the air
several meters above occurs on a: a. clear, calm afternoon. b. clear, windy afternoon. c. cloudy, calm afternoon. d. cloudy, windy afternoon.
The Maghreb consists of Morocco, Algeria, and:
A) Egypt B) Saudi Arabia C) Tunisia D) Nigeria
"Closed canopy" forests are those in which tree crowns
A. Cover about 20 percent of the ground surface B. Include all sizes of trees C. Cover most of the ground D. Cover less than 10 percent of the ground surface E. Crowd out smaller vegetation