What is the exact latitudinal range for tropical regions,which harbour more species than temperate or polar areas?

  • A
    $71^{\circ} N$ to $71^{\circ} S$
  • B
    $23.5^{\circ} N$ to $71^{\circ} N$
  • C
    $23.5^{\circ} N$ to $23.5^{\circ} S$
  • D
    $71^{\circ} N$ to $23.5^{\circ} S$

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The species-area relationship is a straight line described by the equation:

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Given $S =$ species richness,$A =$ area,$Z =$ slope of the line,and $C =$ $Y$-intercept. If area is on the $X$-axis and species richness is on the $Y$-axis,what will the graph of $\log S = \log C + Z \log A$ look like?

According to the hypothesis proposed by environmental biologists,a relatively constant environment in the tropics promotes:

$A$ species-area curve is drawn by plotting the number of species against the area. Why is the slope of the regression line steeper when a very large area (like an entire continent) is considered compared to smaller areas?

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