With reference to biodiversity, which ofthe following statements is/are correct?

1. Species richness and high degree of endemism are important criteria for identifying biodiversity hot spots.
2. Species diversity is highest in the tropics and decreases down the poles.
3. Biodiversity coriservation may be in situ as well as ex situ

Select the correct answer using the code given below:

• 1 only

• 2 and 3 only

• 1 , 2 and 3

• 1 and 3 only