When you breathe in, you take in ___
oxygen
When you breathe out, you expel ___ ___
carbon dioxide
Under your lungs, there is a big muscle called the ____
diaphragm
The excretory system helps eliminate ____ from your body
waste
The body can eliminate waste through the skin through a liquid called ___
sweat
Inside the mother, a baby grows in the ____
uterus
How long does a human baby develop in the uterus?
9 months
The heart, arteries and veins.... these are part of the
circulatory system
