A snail-like, coiled, porous test (shell) of calcium carbonate is characteristic of which group?

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#Question id: 11332

#XL - T Zoology

The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that

 A) tropical communities are older.

 B) tropical regions generally have more available water and higher levels of solar radiation.

 C) higher temperatures cause more rapid speciation.

 D) diversity increases as evapotranspiration decreases.

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#Question id: 11333

#XL - T Zoology

Small geographic areas with high concentrations of endemic species and a large number of endangered and threatened species are known as

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#Question id: 11334

#XL - R Botany

To qualify as a biodiversity hotspot, a region must meet following two strict criteria

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#Question id: 11338

#XL - R Botany

The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that

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#Question id: 11339

#XL - Q Biochemistry

Calculate the free energy change for glucose entry into cells when the extracellular concentration is 5 mM and the intracellular concentration is 3 mM.

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#Question id: 11368

#XL - S Microbiology

Which of these statements about prokaryotes is correct?