1. Characteristics of Living Things
Cells

2. What we used to believe…
Spontaneous Generation- believed in the 1600’s that life came from non-living matter.
Mice from hay
Frogs and turtles from the mud at the bottom of ponds
Rotten meat turning into maggots

3. Francesso Redi disproved this theory. All Living Things…
Francesso Redi disproved this theory. All Living Things… * have CELLS (and DNA) *SENSE & RESPOND to change *REPRODUCE (sexually- 2 parents; asexually-1 parent) *use ENERGY *GROW and DEVELOP *have the ability to MOVE *exchange gases *excrete wastes

4. The Bare Necessities of Life
1. Organisms must have FOOD.
*producers
-make their own food
*consumers
-eat other organisms
*decomposers-
-break down the nutrients in dead
organisms and animal wastes.
2. Organisms depend on WATER.
3. Organisms need AIR.

5. 3. Organisms need AIR. oxygen to release the energy in food
3. Organisms need AIR. *oxygen to release the energy in food. *plants, algae, and some bacteria use carbon dioxide. 4. Organisms must have a place to live where they can get the things they need. Homeostasis- maintaining a stable internal environment * sweat: to cool off *shiver: to warm up

6. Atoms, Elements, and Molecules
Make up everything living and non-living
Tiny particles that make up all matter.
Element
A substance made up of one type of atom
Molecule
When two or more atoms join together

7. ELEMENTS: C – carbon O – oxygen H – hydrogen
MOLECULES:
H2O water
O2 oxygen
CO carbon dioxide
C6H12O6 glucose

8. Dr. Birdley
Glue in the Dr. Birdley Levels of Organization Comic Strips on the next page of your lab book.

9. Levels of Organization
Living
Cells
the smallest unit of life
Tissues
a group of similar cells that perform a common function
Organs
made of tissues and serves a specific function

10. Organ Systems (or just Systems)
A group of organs that work together to perform body functions
Organism
a living thing; anything that can carry out life processes independently

11. Non-Living Organelles Molecules Atoms cell parts with specific jobs
When two or more atoms combine to form a new substance
Atoms
What everything living and non living is made of; smallest unit of matter