Which of the following is correct option

Which of the following is a correct option for species diversity ?

Which of the following is the correct option of regent for the given conversion ?

Which of the following is the correct option of reagent for the above conversion ?

Which of the following is the correct option for decreases order of concentrations of different types of antibodies which are produced in our body ?

The pH of three solutions A, B, C is 6, 4, 8 receptivity which of the following is the correct option?

Which of the following is the correct option for the free expansion of an ideal gas under adiabatic condition?

Which of the following is the correct option for the congruency of the two triangles ABC and PQR as per the SAS congruency criterion ?

In the following reaction ,MnO2 acts as a catalyst 2KCL0_3rarr 2KCL+3O_2 Which of the following is the correct option?