Clues These are found in the spongy mesophyll and allow the diffusion of gases through the leaf a_r s _ _ _ _ s

The spreading out of particles resulting in a net movement from an area of higher concentration to an area of lower concentration. d _ _ _ _ _ _ _ n

The transfer of carbon dioxide and oxygen between an organism and its environment g _ s e _ _ _ _ _ _ e

one of a pair of structures which controls the opening and closing of the stomata. g _ _ _ d c _ _ l

An orgainism at the beginning of the food chain. this is usually a green plant or algae which makes glucose by photosynthesis. p _ _ _ _ _ _ r

the plant tissue that contains large air spaces and has a large surface area for diffusion. s _ _ _ _ y l _ _ _ r

small openings in the surface of a leaf that allow gas exchange between the plant and its environment. s _ _ _ _ _ a

the waterproof top layer of the leaf. w _ _ y c _ _ _ _ _ e​