Look at the questions ⤴️⤴️⤴️pl answer

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!

for a different answer set the answer would be because the oxygen in the water had depleted (apex)