if dermal tissue covers the entire plant tham what about the gases exchange for inner tissue of plant
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WITHIN THE EPIDERMIS, THOUSANDS OF PAIRS OF BEAN-SHAPED SCHLERENCHYMAL GUARD CELLS SWELL AND SHRINK BY OSMOSIS TO OPEN AND CLOSE STOMATA, TINY PORES WHICH CONTROL THE EXCHANGE OF OXYGEN AND CARBON DIOXIDE GASES AND THE RELEASE OF WATER VAPOR.
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