Answering 2 short questions and writing a dichotomous key

Hello 

There is two questions about diet categories, the information you need to answer the questions here in the pictures. 

And This is the questions for the dichotomous key:

Write a dichotomous key for the five skulls based on the characteristics you measured. remember that you must use couplets (2 leads) to construct your key. ((look at the picture to know the skulls))

look at the 2 files I uploaded to do the assignment 

Let me know if you have any questions.