Here's a breakdown of how living things handle energy:
Acquiring Energy:
* Autotrophs (like plants) obtain energy directly from sunlight through photosynthesis.
* Heterotrophs (like animals) obtain energy by consuming other organisms.
Storing Energy:
* Organisms store energy in various forms, primarily as chemical bonds within molecules.
* Carbohydrates (like glucose) are a common energy storage molecule.
* Lipids (fats) are another important energy storage form, providing more energy per unit weight than carbohydrates.
Using Energy:
* Cellular respiration is the process by which organisms break down energy-rich molecules like glucose, releasing energy that can be used for various life processes.
* This energy is used for:
* Growth and development: Building new cells and structures.
* Movement: Contracting muscles, moving fluids, and transporting substances.
* Reproduction: Creating offspring.
* Maintaining homeostasis: Regulating internal conditions like temperature, pH, and water balance.
* Responding to stimuli: Detecting and responding to changes in the environment.
Important Note: The ability to acquire, store, and use energy is a defining characteristic of life. Non-living things, like rocks or water, do not possess this capacity.
