Planktonic organisms often have needle-like structures that ________
A) are used as a defense mechanism
B) are used as paddles to catch ocean currents
C) increase density
D) prevent sinking
E) serve as a "skeleton" to support the diatom
D
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Alternative energy sources
A. are all renewable (except for nuclear energy). B. are sources of electricity and heat that emit little or no carbon dioxide. C. include solar, geothermal, biomass, and nuclear. D. All of these
The ________ region is a transition zone between the savanna and desert environments of sub-Saharan Africa
A) Sahel B) rainforest C) ITCZ D) UNAIDS
When Hudson kicks a can, the speed given to the can is greater if the can is
A. light. B. heavy. C. heavy or light makes no difference. D. no way to say.
What prevents hurricanes from developing in the band five degrees on either side of the Equator?
A) The Coriolis Effect is too weak. B) Too much precipitation. C) Temperatures are not high enough. D) Lack of wind near the Equator.