Stomata on the underside of the leaf control the passage of gases into and out of the leaf.
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Capillaries. Since they are only once endothelial cell thick, they can exchange gas, nutrients, and waste across their membrane. Capillaries in the brain have endothelial cells close together to onyl allow a slecetive exchange of materials, while capillaries in the kidney or liver have gaps between the endothelial cells to allow the exchange of a lot of materials.
Valuable principals and approaches that have been laboriously gleened from one field to hasten the progress in another.
provides space for gas exchange, to allow CO2 in and O2 out.
sediments made of larger particles will have larger spaces between them, and thus allow greater fluid flow.
The molecules of a gaseous form slow down, thus shrinking in volume. As you know, molecules/atoms are in constant motion, and with temperature fluctuations, they either slow down, and compress, or they increase in speed and expand. Ever notice that tires seem a bit flat in the winter? Or bridges have little gaps to allow room to expand in summer months, as well as for when they "shrink" in cooler temperatures the overall structure is not corrupted.