the process of breathing
"a living thing, that can be a plant or animal."
"The process of havin babies, producing young, or producing new plants."
"a chemical element that is a gas with no smell or colour. it forms a large part of the air on earth, and is needed by animals and plants to live."
“All the chemical processes in your body, especially those that cause food to be used for energy and growth."
"Change in quality, amount or level."