With reference to biodiversity, which of the following statements is/are correct? 1. Species richness and high degree of endernism are important criteria for identifying biodiversity hot spots. 2. Species diversity is highest in the tropics and decreases down the poles. 3. Biodiversity conservation may be in situ as well as ex situ. Select the correct answer using the code given below:

• A

  1 only
• B

  2 and 3 only
• C

  1,2 and 3
• Correct answer
  D

  1 and 3 only

Hence, the correct answer is option: 'D'.