If you had a type of cancer that involved the immune cells in your central nervous system that ingest intruders (similar to how macrophages function in the peripheral body), what cell would be affected?

Phagocytes.

Explanation:

Phagocytes are the cells which would be affected by the cancer that involved the immune cells in our central nervous system that ingest intruders. If the cells that ingested intruders also turn into cancer cells then there is decrease occur in the number of Phagocytes and the body's immune system get weaken and unable to defend the body against pathogens. Phagocytes are a type of white blood cells that use phagocytosis method to engulf bacteria, foreign particles, and dying cells to protect the body.

the index of refraction of the second medium is higher. i just took the test trust me !

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: