Gases diffuse most efficiently across a) thin, moist selectivly permeable membrane. b) thin, moist impermeable membrane. c) thick, moist selectivly permeable membrane. d) thick, moist impermeable membrane

Gases diffuse most efficiently across : A. Thin , moist selectively permeable membrane
gases diffusion is better at this type of medium because thin and selectively permeable membrane make it more easier for the gases to move to the area of lower concentration

hope this helps

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

The answer is probably c. xylem