1. How do Scientists Classify Organisms?
Chapter 7 lesson 1

2. Kingdoms of Living Things
Biologists use a scientific system that organizes living things into groups.
Organisms are classified according to internal and external characteristics.
(Would a turtle and a dog be classified together?)
Scientists use dichotomous keys to help identify organisms.

3. Bacteria
Bacteria are among the smallest of organisms and are the most numerous.
Bacteria are single-celled and do not have a nucleus.
Bacteria are divided into two kingdoms: archaebacteria and eubacteria
Archaebacteria are the oldest known organisms

4. Protists

5. Protists Most protists are single-celled
All protist cells have a nucleus.
Animal like protists are called protozoa.
Algae are an example of plant like protists.
Many Fungi-like protists have harmful effects on plants and animals.

6. FUNGI Fungi can be single-celled or multicellular organisms
All fungal cells have a nucleus.
Fungi cell walls are made of the same substance that forms insect shells. (Think of a roach when you step on it.)
Fungi absorb nutrients from their environment by decomposing organic tissue.

7. Copy the life cycle of a mushroom P. 286