D none of above as i think it is air
hope it helps
Vascular plants have tube like structures that carry water, nutrients, and other substances throughout the plant. Nonvascular plants do not have these tube like structures and use other ways to move water and substances. ... Distinguish between characteristics of seedless non vascular and vascular plants.
Animal dander would be the answer you're looking for.
Hope this helps :)
Definition of Selectively PermeableMembranes. All cells are enclosed with a cell membrane. A selectively permeable cell membrane is one that allows certain molecules or ions to pass through it by means of active or passive transport.