Answer:
tar
Explanation:
tar is the reason your lungs go black because it is evaporated into the smoke that you breathe in and is known to be the most known cause of cancer
I feel like this question is very troll but my guess is for less weight to hold them down....
The Ovaries hold the females infertile eggs, and the Fallopian tubes carry the eggs to the uterus, which is where the offspring is conceived.
I'm pretty sure that the answer is C.