The immune system.
The immune system
Cardiovascular
To make energy for their bodys, and to STAY ALIVE!!!
Circulatory system
yes
I believe the bodies transportion system is the cardiovascular system :)
Respiratory
Well... They build up a layer of fat which powers their bodys.
It protects the body by fighting sickness and defending it from foreign invaders, such as bacteria. micro organisms, viruses, and parasites
immune system
nervous system
Glands that excrete hormones.