Both prokaryotes and eukaryotes cells have this structure and maintain homeostasis and has a boundary between the inside of the cell on the outside environment it is me

the answer is membrane, the nucleus (which is the center of a eukaryotic cell is surrounded by the nucleus membrane and the cell wall that is protecting the cytoplasm around it is the cell membrane :D

plato users:

d.  

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