Population age structure is a summary of the number of individuals of each age in the population. An example is, In 2002, 30% of the worlds population was under 15 years old. <span />
The lymphatic system is an important part of the immune system. The lymph nodes filter lymph fluid as it flows through them, trapping bacteria, viruses, and other foreign substances, which are then destroyed by special white blood cells called lymphocytes. Bone marrow.
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