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: 946

#1. Molecules and their Interaction Relevant to Biology

Aspartate is the precursor for which of the following amino acids?

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#Question id: 20982

#12. Applied Biology

Which is considered as the most recalcitrant of the BTEX compounds, and of greatest regulatory concern because of its associated health impacts?

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#Question id: 4975

#11. Evolution and Behavior

The observation that tusks were limited to males in several species, and were apparently not used in food-gathering, is evidence that the tusks probably

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#Question id: 10950

#7. System Physiology – Animal

Presentation of antigen on MHC-I by a cell will result in

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#Question id: 11136

#7. System Physiology – Animal

Most of the neurons in the human central nervous system are ________.