C. Re-arrange the letters to form the correct words or parts of the respiratory system and write it in COLUMN A. Choose the function of each part below and write the letter of your choice in COLUMN B. COLUMNB COLUMNA PARTS (Parts)
1. UNGLS
2. ATCHRAE
3. IBORHCN
4. PXNHARY
5. MDAPIHRGA
Column B(function) letter only.

help me plss, i need it know... im gonna pass it tom.. help me plsss..
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speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.