7. 5. Maintain a stable internal
environment
• Keeping a constant internal environment,
even when external conditions change
dramatically, is called homeostasis
8. 6. Obtain and use material and
energy
• Chemical reactions that break down
materials and then reassemble them to
build the organism are called metabolism
9. 7. Groups of organisms evolve
over time
• All living things share a common origin
more than 3.5 billion years ago and have
evolved over time into the species present
today
10. 8. Made of cells
• All living things are composed of one or
more cells