What type of living things have a cell membrane

Living things such as flowers, grass, trees, and mosses are made of plant cells. Animal cells are surrounded by a thin and flexible cell membrane. Because the cell membrane is flexible, animal cells can have many different shapes. This is why cells in your body can look so different.

Explanation:

All cells have cell membranes. There are variations between cell membranes, but the same basic structure exists in all cells. While some cells will also have a cell wall to provide additional support and protection, this does not replace the cell membrane. Cell membranes are selectively permeable.

your answer is "the 1950's"

the scientific method.