What parts of the lymphatic system are used as filters to catch bacteria in the inhaled air? a. bronchi b. epiglottis c. trachea d. tonsils

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

Abnormal softening of a gland is known as

The galapagos island contain 13 species of finches four of the species are seen here it is believed that all of the species had one common ancestor and overtime