Permafrost soil (gelisol) is
a. resistant to erosion
b. fragile
c. rich in microorganisms
d. a fast developing soil

Permafrost soil (gelisol) is b. fragile. Permafrost soil is a region of the Earth's surface (ground or soil) that is at a temperature below freezing temperature. This makes it very brittle and sensitive to heat exposure, making it very fragile. This is often found in countries where the climate is very cold such as Canada etc.

Ido not understand.