What is the passage from the mouth to the larynx and esophagus?

•pharynx

•trachea

•bronchi

•alveoli

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

the answer is 75.0%.

catya your not at all which answer i've seen you do this on another question!