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

Athe soil is fertile

Brainfall is adequate

Cthe top layer of soil freezes

Bthe top layer of soil thaws

Verified Answer :

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