* Cell membranes are essential for all living cells, including those of plants and animals.

* They act as a barrier between the inside and outside of the cell, controlling what enters and exits.

* This is vital for maintaining the cell's internal environment and allowing for important processes like nutrient uptake and waste removal.

While both plants and animals have cell membranes, there are some differences:

* Plant cells have a cell wall outside their cell membrane, providing structural support and protection.

* Animal cells do not have cell walls.

However, both plant and animal cells rely on their cell membrane for their basic functions.