Dude what do need help with??
I believe it’s carbon dioxide, because you use your respiratory system to breathe in oxygen, and oxygen goes through your circulatory system. And you breathe out CO2.
Answer:
You didn't give options, but I would say either rat guts, animal fecal matter, or bugs.
Explanation:
<span>Hodgkins
</span><span>- Cancer that affects the lymphatic system, one of the immune system components. Characterized by abnormal development and transformation of immune cells called type B lymphocytes These cells grow, proliferate and accumulate in the lymph nodes.
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<span>What is parkinson's disease:
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<span>Parkinson's disease is a degenerative disease that results from slow and gradual death of brain neurons<span>.</span></span>