The thymus is positioned in the upper chest cavity above the heart. Thymus. The thymus gland is the main organ of the lymphatic system. Located in the upper chest region, the primary function of this gland is to promote the development of specific cells of the immune system called T lymphocytes. T lymphocytes or T-cells are white blood cells that protect against foreign organisms (bacteria and viruses) that have managed to infect body cells.
How long does it take for the Earth to rotate on its own axis ? The time it takes the Earth to rotate once is called a day (24 hours). The actual rotation time is a little less, about 23 hours and 56 minutes. Why do we have Day and Night?
When it is facing the sun, it is day and when it is not facing the sun it is night. It takes one full day (24 hours) for Earth to complete one rotation so every day we have 1 Day and 1 Night. Answer <br /> Day and night is the result of the rotation of the Earth on its own axis. The axis of the Earth is an imaginary line that passes through the North and the South poles. <br /> <br /> Answer <br /> The earth rotates on its axis as it faces the sun.