Osmosis is the flow of water down its concentration gradient, across a semi-permeable membrane. ... An everyday example is the plastic wrap in your kitchen: it allows air and water vapor to travel across it, but not water or food. The membranes of cells are semi-permeable, too.
Mitochondria use oxygen to make ATP in a process called oxidative phosphorylation. Mitochondrion are found in most eukaryotic cells which are cells that make up plants, animals and fungi.
