Grasses and mosses sprout in Alaska’s tundra in summer when _____.

A. the soil is fertile

B. rainfall is adequate

C. the top layer of soil freezes

B. the top layer of soil thaws

Respuesta :

I think it's B. The top layer of soil thaws.  

Grasses and mosses sprout in Alaska’s tundra in summer when _____.

  the top layer of soil thaws