These scientists are called upon to teach careful excavation methods to those studying taphonomy at the Body Farm:

I believe it's a physical anthropologist.

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.