Archeological evidence suggests that boat technology was developed about ________ years ago
A) 50,000
B) 5,000
C) 500,000
D) 4,000,000
A
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The development of new varieties of grain crops increased productivity by increasing the
A) surface area of the leaves of the plants. B) size of the roots and ability to absorb water. C) strength of the stems to support more grains. D) size and number of seeds.
When basaltic lava reach the ocean they
A. can flow long distances on top of the water. B. cause lava fountains at the vent on land. C. form pillow basalts. D. form circular calderas. E. All of these choices are correct.
Sorted sediment deposited by glaciofluvial action are called
A) glacial erratics. B) stratified drift. C) till. D) moraines.
Which of the following best matches the description?Competition between members of the same species.
A. carbon cycle B. denitrifying bacteria C. ectoparasite D. limiting factor E. habitat F. nitrogen cycle G. nitrogen-fixing bacteria H. community I. herbivore J. trophic level K. intraspecific competition L. interspecific competition M. omnivore N. biomass O. producer P. secondary consumer