A cellular structure

All living things, whether big or small, are made up of tiny units called cells. These cells are microscopic, meaning they are so small that they can only be seen under a microscope. Cells are responsible for all the actions and processes in the bodies of living things, such as growing, moving, and reproducing.

• All the characteristics of living things (such as growth, movement, reproduction, and response to surroundings) are found in every cell of a living thing, whether it is made of one cell (unicellular) or many cells (multicellular).
• The cellular structure is the basic and most important feature of all living things.
• Without cells, no living thing would be able to perform the processes that keep it alive.
• The giant tortoise found on the Galapagos Islands in South America can live for up to 170 years, which is a very long time.
• On the other hand, the mayfly has a very short lifespan, living only for 1 hour to 24 hours.

Unicellular organisms are living beings composed of a single cell, which performs all life functions independently. An example is amoeba, a microscopic organism that can only be seen with a microscope.

Multicellular organisms are living beings composed of multiple cells, which work together to perform various functions essential for survival. Examples include humans, cows, mice, cockroaches, elephants, banyan trees, and onion plants.