________ limestones have a clastic texture.
A. Oolitic
B. Inorganic
C. Chemical
D. Fossiliferous
E. Bioclastic
Answer: A
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Two species of frogs do not interbreed because one species breeds in March and the other species breeds in May. This is an example of
A. allopatric speciation. B. a postzygotic reproductive barrier. C. a prezygotic reproductive barrier. D. sympatric speciation.
If the gradual rise of deep water at temperate and tropical zones were to stop, the thermocline would rise, making the difference in water layers steeper
Indicate whether the statement is true or false
In a protein antigen, how many amino acids are necessary for the antigen to bind to a receptor on a T cell?
A) 1 or 2 B) 3 to 5 C) 5 to 7 D) 10 to 15
Seasonal fluctuations in CO2 emissions reflect
A) seasonal changes in vegetation cover in the higher latitudes of the Northern Hemisphere. B) summer melting in the tundra. C) increased fuel use for home and building heat in winter months. D) geothermal activity, which is highest in the fall.