- Life Sciences
simple epithelium with flattened cells found in the inner lining of the mouth, oesophagus and blood vessels and alveoli of the lungs.
vascular tissue that conducts food substances from the leaves to other parts of the plant. The...
an alkaline watery fluid containing digestive enzymes, which is secreted into the mouth by...
the sheet-like muscle found below the ribcage that plays a vital role in breathing.