What chiefly distinguishes a biosphere reserve from a national park?

Explanation

1. 01

   A biosphere reserve is built around zoning rather than a single boundary.

2. 02

   The core is legally protected and left undisturbed; the buffer allows research and limited use; the transition zone supports settlement and farming.

3. 03

   A national park, by contrast, prohibits habitation and most use throughout its area.