Answer:
B) Crustacea
Explanation:
All of the other choices have to do with chemicals, cancer or some other form of science, but Crustacea is a type of sea anthropod that has nothing to do with cancer.
Lymph vessels are more like valves than veins. They prevent back flow, so things only need to go in one direction, unlike other areas of heavy traffic. Let me know if you need more. :)
One exercise that should be included is stretching before and after
