DENDROLOGY

Detailed explanation-1: -The green parts of land plants are covered with tiny units called stomata, which is Greek for mouths. Stomata are formed by two cells, called guard cells, each a mirror image of the other, which together form a ring shape like a doughnut (those with a hole).

Detailed explanation-2: -Plants do not breathe, so they need to get oxygen through the stomata, the small little holes in their leaves, and also through their roots. In respiration, the oxygen is used to help metabolize and burn the sugars into energy.

Detailed explanation-3: -Plants help us breathe by taking in carbon dioxide, and letting out oxygen through their leaves. This process is called plant respiration.

Detailed explanation-4: -Plants breathe through tiny holes in their leaves called stomata. So, all living things breathe.