make up the greatest proportion of the biomass in nearly all ecosystems.

Which innate immune cell produces histamines?

Where do T cells (lymphocytes) mature? 

Where in the lungs does gas exchange occur with the blood vessels?

Which structure of the respiratory system contains the vocal cords (sometimes called vocal folds)?

Which branch of the immune system includes both the cell-mediated response and antibody-mediated response?

What is the primary structure responsible for normal breathing (tidal breathing)?

                       is the sugar in DNA, while                         is the sugar in RNA.

Translation occurs in the nucleus of eukaryotic cells.

All blood cells are originally produced within the liver.