Here's why:
* Obtaining Materials: Organisms need energy to power processes like hunting, gathering food, or absorbing nutrients from the environment.
* Transforming Materials: Breaking down food into usable components, building new cells, and synthesizing complex molecules all require energy.
* Transporting Materials: Moving nutrients, waste products, and signaling molecules throughout the body requires energy to power pumps, diffusion, and other transport mechanisms.
Examples:
* Plants: Photosynthesis, the process of converting light energy into chemical energy, fuels the entire plant.
* Animals: Cellular respiration, the process of breaking down food to release energy, powers all animal functions.
In short, energy is the currency of life, and without it, organisms cannot perform the fundamental tasks necessary for survival.
