In biology and ecology a resource is defined as a substance that is required by a living organism for normal growth, maintenance, and reproduction (see biological resource). The main essential resources for animals are food, water, and territory.

Resources in Science

Resources refer to the materials or substances that are available in the environment and can be used for various purposes. In science, resources can be classified into two categories - natural resources and man-made resources.

Natural Resources
Natural resources are the resources that are found in nature and are not created by humans. These resources are renewable or non-renewable.

1. Renewable Resources
Renewable resources are the resources that can be replenished naturally over time. Examples of renewable resources are:

- Solar energy
- Wind energy
- Water (hydro) energy
- Biomass energy

2. Non-Renewable Resources
Non-renewable resources are the resources that cannot be replenished once they are used up. Examples of non-renewable resources are:

- Coal
- Petroleum (oil)
- Natural gas
- Minerals

Man-Made Resources
Man-made resources are the resources that are created by humans for various purposes. Examples of man-made resources are:

- Cement
- Bricks
- Glass
- Plastics
- Metals

Importance of Resources
Resources are important for various reasons. They are used for:

- Energy production
- Building materials
- Food production
- Medicines
- Clothing

Conclusion
In conclusion, resources are essential for human survival and progress. It is important to conserve and manage resources wisely to ensure their sustainability for future generations.