The cell is the basic unit of structure of living organisms
The systems are composed of the organs , the organs are composed of the tissues , and the tissues are composed of the cells , The cell is the building unit of the living organism’s body , and it is the unit of structure in the living organisms .
The animal cell
The animal cell is the building unit of the animal body , The body of the animals or the humans is made up of a group of systems ( as the digestive system , the respiratory system , the circulatory system , ……..) that work integrally to keep the living organisms alive .
The systems consist of a set of organs ( as the stomach , two lungs , the heart , ………) , Each organ consists of a group of the similar or different tissues , Each tissue consists of a group of symmetric units called the cells .
The plant cell
The plant cell is the building unit of the plant body , and the plant body also is made up of system ( the shoot system and the root system ) .
These systems are made up of organs as the roots , the stems and the leaves , Each organ in the plant is made up of tissues , and each tissues is made up of similar units called the cells .