Organisms need to obtain energy via cellular respiration as it is the process by which their cells convert food into a useable form of energy called adenosine triphosphate (ATP). ATP is the primary energy currency in cells, and it is required for various cellular activities such as muscle contraction, active transport of molecules across cell membranes, synthesis of molecules, and maintenance of homeostasis. Cellular respiration allows organisms to extract energy from the nutrients they consume, break them down into simpler molecules, and convert them into ATP, providing the necessary energy for the organism's survival and functioning.
