Answer:
Permafrost areas have very cold air temperatures, thin topsoil, and most water is frozen during the winter. ... Tundra is found at high latitudes and at high altitudes, where the permafrost has a very thin active layer. The active layer of tundra is too thin for trees to grow, because it cannot support a tree's roots.
D. it serves as a link between membrane proteins on adjacent membranes.
What exercise? Post a picture of it.
D. Same as the number of adenines
Thymine and Adenine will always pair together
:)
