1. Energy: All living things require a constant supply of energy to power their life processes. This energy is used for:

* Growth: Building new cells and tissues.

* Movement: Contracting muscles, swimming, flying, etc.

* Reproduction: Creating offspring.

* Maintaining internal conditions: Regulating temperature, pH, and other internal factors.

* Source of energy: Organisms obtain energy in different ways:

* Autotrophs: Like plants, algae, and some bacteria, make their own food using energy from sunlight (photosynthesis).

* Heterotrophs: Like animals, fungi, and many bacteria, obtain energy by consuming other organisms.

2. Nutrients: Organisms need specific chemical building blocks to construct their bodies. These nutrients include:

* Carbon: The backbone of all organic molecules.

* Nitrogen: Found in proteins and nucleic acids (DNA and RNA).

* Phosphorus: Essential for energy transfer and nucleic acid structure.

* Water: Essential for many biological processes, including transporting nutrients and regulating temperature.

* Minerals: Various other elements like calcium, potassium, magnesium, etc., that are crucial for specific functions.

* Obtaining nutrients: Organisms obtain nutrients from their environment through:

* Ingestion: Taking in food.

* Absorption: Taking in nutrients through their skin or other surfaces.

3. A Suitable Environment: Every organism has a specific set of environmental conditions it can tolerate. This includes factors like:

* Temperature: Too hot or too cold, and an organism cannot function properly.

* Water: Most organisms need access to liquid water for survival.

* Oxygen: Many organisms require oxygen for respiration, the process of extracting energy from food.

* pH: The acidity or alkalinity of their surroundings.

* Sunlight: For photosynthetic organisms, sunlight is essential for energy production.

* Adaptation: Organisms evolve adaptations that allow them to thrive in their specific environment.