What activities do you usually do in the summer or on free time (research)

What is the most abundant vertebrate on earth?

Wich is not standing in the way of astronomers getting a good view of different star

What are some of the immune functions of the lymphatic system? a. cleaning red blood cells from the blood and creating lymph fluids b. transporting lymph to the tissues and creating lymph fluids c. removing infectious agents and making white blood cells d. making red blood cells and removing infectious agents