Final answer:
The concept that organisms keep their internal environment completely constant at all times through homeostasis is false; instead, they maintain conditions within a narrow range appropriate for vital functions.
Step-by-step explanation:
The statement that organisms are capable of homeostasis keep everything in their internal environment constant at all times is False. Homeostasis refers to the ability of an organism to maintain internal conditions within a narrow range almost constantly, despite external environmental changes. This does not mean that everything is kept constant, but rather that conditions are regulated to a stable level.
For example, in humans, the process of thermoregulation helps to maintain a stable internal body temperature. If one goes outside when the air temperature is below freezing, the body will employ mechanisms like shivering to prevent the internal temperature from dropping to dangerous levels. Similarly, cells must create and maintain conditions appropriate for crucial functions like growth and reproduction, which demand maintaining different internal environments from the external ones.