The finches on the Galapagos Islands
were similar in form
except for variations in
their beaks. Darwin
observed that these
variations were useful
for
A. Attracting a
mate
B. Defending
territory
C. Building nests
D. Gathering food

there is not 1 highest source of protein, but there are many; meats, fish, poultry, seafood, cheese, eggs, yogurt and milk. the only non complete animal food that is beneficial is gelatin.

sorry if this did not , have a great day!

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.