Which of the following ecologist gave ‘rivet popper’ hypothesis?

What is common to the species shown in figures $\mathrm{A}$ and $\mathrm{B}$ ?

Which of the following is not done in a wildlife sanctuary?

 Definitions / Explanation: $\boldsymbol{\beta}$ - diversity

As estimated by Robert May, what is total number of species present on earth?

Species-area relationships among very large areas like the entire continents the $Z$ values in the range of