1. NATURE OF LIFE
NOTES

2. What is Biology?
• the study of living things.
– BIO-: life
– -OLOGY: study of

3. Characteristics of
Life
How do you know
something is living?

4. Which of the following
• Spider Web
is Living? • Bicycle
• Yogurt
• River • Bananas
• Tornado
• Rock • Baby
• Fire
• Rain • Hibernating Bear
• Seed
• Onion • Robot
• Mushrooms
• Potatoes • Peas
• Frog
• Horse • Corn
• Icicles
• Grass • Jellyfish
• Eggs
• Tree & Leaves • Sun
• Rocking Horse
• Cacti • Cloud
• Teddy Bear

5. All living thing…
• Made of cells
– Basic unit of life
– Unicellular: made up of one cell
– Multicellular: made up of many
cells

6. All living thing…
• Reproduce
– Asexual reproduction: has only 1 parent
– Sexual reproduction: needs 2 parents

7. All living thing…
• Grow and Develop
– Growth: increase in size or shape
– Development: mature over time

8. All living thing…
• Have a genetic code (DNA/RNA)
– DNA: deoxyribonucleic acid
– RNA: ribonucleic acid

9. All living thing…
• Use and Need Energy
– Energy comes from “food”
• Producers: get their energy from the sun
• Consumers: get their energy by eating other
organisms

10. All living thing…
• Respond to environment
– Reacts to stimuli
• Stimuli: signal to which an organism responds

11. All living thing…
• Maintain homeostasis
– Homeostasis: a process in which organisms maintain
a stable internal environment
– Examples: sweating, shivering, panting

12. All living thing…
• Evolve
– Changes of a long
period of time
involving the entire
group