They only have one cell.
Unicellular
They have many cells.
Multicellular.
Cells of the same type form layers in our body.
Tissues
A group of tissues that work together to perform a specific job.
Organ
Several organs workimg together.
System
This system breaks down food into nutrients.
Disgestive system
They break down food into smaller pieces.
Teeth
It pushes the food down to the stomach.
oesophagus
It separates food from waste.
Small intestine.
It carries the nutrients to all parts of the body
Blood
This system helps you breathe.
Respiratory system
When we breather in through the nose and mouth, the air enters the....
Lungs
We breathe it in.
Oxygen
We breathe it out.
Carbon dioxide.
It is a big muscle under the lungs which helps us breathe.
Diaphragm
It is made up of thousands of tubes called arteries and veins.
Circulatory system
