I believe the answer you're looking for is Evolution.
All cells have a cell membrane. its basically what protects the cells from getting toxins that are sometimes entering your body. without a membrane on all cells, you would get sick a lot!!
(I'm not sure but i think these are the answers)
composed of one or more cells
contains genetic program
acquires and uses energy
A stem cell is a cell that has layers of bacteria that helps protect the water that follows through it.
Answer:
There are the physical and chemical properties of an acid .
Both are in the image