Cellular respiration is the metabolic process by which a cell produces usable energy in the form of ATP. In order to accomplish this cells require Glucose and Oxygen to form the reaction which produces ATP and the byproducts of Water and CO2.
In reality its a complex topic however this is the basic form.
DNA is being used as a template to make a molecule of mRNA.
Its called adaption when an animal changes itself to be able to survive