Why can even low levels of a toxin have serious effects, if the toxin doesn't break down easily, like mercury?

below

Explanation:

also depends on the immune system some people it'll effect greater due to a weaker immune system

A) Lymphatic capillaries to collecting vessels -Correct

B) Lymph nodes to lymph capillaries - Incorrect

C) Collecting vessels to lymphatic trunks- Correct  

D) Collecting ducts to collecting vessels- Incorrect  

E) Thoracic duct to cisterna chyli - Incorrect

F) Right sub-clavian trunk to thoracic duct - Incorrect

G) Intestinal trunk to right lymphatic duct - Incorrect  

H) Left lumbar trunk to thoracic duct - Correct

I) Lower extremity lymph to thoracic duct - Correct  

J) Right head lymph to thoracic duct - Incorrect