Which of the following statements is true? A. An isolated system cannot exchange either matter or energy with its surroundings. B. Organisms are open systems when they are out of their habitats. C. Organisms are isolated systems because they have their own machineries in the cells to supply all the matter and energy they need. D. Open systems are called as such because they do not absorb energy, but just openly release the energy to their surroundings.

A. An isolated system cannot exchange either matter or energy with its surroundings. This statement is true.

• An isolated system is one where neither matter nor energy can enter or leave the system. The core characteristic of an isolated system is its complete separation from external influences. This concept is mostly theoretical because perfect isolated systems do not exist in reality, as there is always some form of energy exchange, even if just minimal, with the surroundings.
• Statements B, C, and D are not true. Organisms are open systems regardless of being in or out of their habitats, since they continuously exchange matter and energy with their surroundings. Organisms cannot be considered isolated systems; they need to take in nutrients and energy from the environment and expel waste products to survive. Open systems are referred to as such because they both absorb and release energy and matter from and to their surroundings, they do not just release energy as mentioned in statement D.