Kayden is explaining to his cousin that all the structures in the body are organized in a specific way from smallest to largest. What example could Kayden give his cousin to demonstrate this organization?
1 heart cell, muscular tissue, heart, circulatory system
2 respiratory system, lungs, blood cell, stomach
3 epithelial tissue, skin cell, nervous system, brain
4 digestive system, respiratory system, nervous system, skeletal system