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a small, corky pore or narrow line on the surface of the stem of a woody plant that allows the interchange of gases between the interior tissue and the surrounding air.
an antigen preparation that stimulates the immune system to give protection against a particular...
a mixture of enzymes and other substances secreted by the exocrine cells of the pancreas.
the cylinder of parenchyma found from the centre of the stem to the inside of the vascular...
a system of support in soft-bodied animals, which relies on pressure of fluids in the body...
the structure that separates the right ventricle from the pulmonary artery. It prevents the...