Where are protons located? A. Outside the nucleus of an atom
B. Inside the nucleus of an atom
C. Inside the nucleus of agell
D. In the cell membrane

B

Explanation:

both the protons and neutrons are located in the nucleus.

I hope this helps

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

thats not even an aswer choice