Gaurd cells is right answer that is option C .
Hope it helps.
Atmosphere.
Hydrosphere.
Biosphere.
Cryosphere.
Lithosphere(also referred to as the Geosphere).
I believe these are the answers:) best of luck!
B. Cell membrane
Remember cell membrane is the structure aka “wall of the house” is the clear boundary between the cells internal and external environments:))
Hope this helps
