How does the immune system work together with the circulatory system to function properly?

a.
the circulatory system's arteries cause the immune system to work harder by bringing oxygen-depleted blood to the infection site.

b.
red blood cells released by immune cells cause increased blood flow to the infection site; this increased blood flow brings other red blood cells to the area more quickly.

c.
white blood cells move through the body (to parts where they are needed) in the blood vessels of the circulatory system to destroy pathogens.

d.
the immune system's red blood cells fight and destroy foreign antigens.
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B. Red blood cells released by immune cells cause increased blood flow to the infection site; this increased blood flow brings other red blood cells to the area more quickly.

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.