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Using the geological time scale, scientists can determine the absolute age of rocks and fossils.
Axillary Nodes
Lymph nodes located in the armpit region that filter lymph fluid as part of the immune system.
Lymphatic Vessels
Thin-walled tubes that carry lymph, a fluid containing white blood cells and waste products, back towards the heart to be returned to the blood circulation.
Red Pulp
A tissue in the spleen composed of blood-filled sinuses and spaces filled with macrophages, playing a role in filtering blood.
White Pulp
Lymphatic tissue in the spleen composed mainly of lymphocytes and responsible for the immune response.
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