Underwater, specialized membranes cover their eyes and allow them to see clearly.

The natural membranes covering her eyes allowed her to see where she was going, and she wouldn't need oxygen for quite some time.

These membranes, when outstretched, allow them to glide between trees.

When legs are stretched out, this membrane allows the sugar glider to glide a considerable distance.

This new membrane synchronizes Earth time to that of the universe and allows the stars to be seen once again.

A semi-permeable membrane allows solvent particles to pass in both directions.

The membrane around a lysosome allows the digestive enzymes to work at the 5 pH they require.

The membrane allows sodium ions to transfer from one cell to the other with minimal electrical resistance.

The membrane allows only positive ions to pass through to prevent the chlorine from mixing with the sodium hydroxide.

The membrane must also not allow either gas to pass to the other side of the cell, a problem known as gas crossover.