Unicellular organisms are able to survive on their own because they have structures that have what important characteristic?

sorry, is there a picture? i do not see any arrows.

wut? unius0123 wut?

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!

i think that it is c, d, and e, hope this