Introduction to Living Things

A living thing is an organized structure. It may be a single-celled such as a bacterial cell, or multicellular such as animals and plants that are made up of several cells. A cell is the fundamental biological unit of an organism.

A non-living thing is anything that was never alive. In order for something to be classified as living, it must grow and develop, use energy, reproduce, be made of cells, respond to its environment, and adapt.

The organisms that are alive and compose of tiny particles, i.e. cells are known as living things. The things, which are once alive or are never alive are known as non-living things. Responsiveness is a trait in living things, through which they sense things and react to external stimulus. As against this, non-living things are insensitive to an external stimulu