Organ are made of multiple organs that work
together to maintain homeostasis in an organism.

systems

Explanation: Cells are organized into tissues, and tissues form organs. Organs are organized into organ systems such as the skeletal and muscular systems. All of the organ systems of the body work together to maintain homeostasis of the organism. If homeostasis fails, death or disease may result.

the way that the mass of carbon can be conserved through cellular respiration is through a process/law called the law of conservation of mass which even tho it undergoes a process, mass is not be destroyed or changed