One of the lymphatic structures has been nicknamed the “tiny lymph cleaners.” which structure is this nickname most likely given to? the lymph nodes the bone marrow the thymus the spleen

The Lymphatic system is compose of organs and tissues that are helping the body to get rid of the waste materials.One of the structure is the lymph nodes which are bean shaped organ filtering and cleansing the lymph thus they are called tiny lymph cleaners. These nodes get swollen if there is an infection in one's body.

Your answer is  d.)relationship between pressure and air volume and led to the understanding of how respiration works