* Energy is not always available: Food sources can be intermittent or unpredictable. Organisms need a way to save energy from times of plenty to use during times of scarcity.

* Energy is needed for various processes: Living things require energy for a vast array of functions, including:

* Growth and development: Building new cells and tissues requires energy.

* Movement: Whether it's walking, flying, swimming, or even just internal processes like beating hearts, movement requires energy.

* Reproduction: Producing offspring is an energy-intensive process.

* Maintaining body temperature: Warm-blooded animals need energy to regulate their body temperature.

* Cellular processes: All the reactions that occur within cells, from protein synthesis to DNA replication, require energy.

* Energy storage enables survival: Organisms that can efficiently store energy are better able to survive periods of famine, cold, or other challenges. This helps ensure their long-term survival and reproduction.

Examples of energy storage:

* Animals: Store energy as glycogen in their muscles and liver, and as fat in adipose tissue.

* Plants: Store energy as starch in their roots, stems, and leaves.

In summary, energy storage is essential for organisms to survive and thrive in a world where resources are not always readily available. It allows them to bridge the gap between periods of feast and famine, and to power the various processes that sustain life.